Dometic 750000005 (TJ18F) Refrigerator User Manual
Contents
1. Phone 804 746 1313 Fax 804 746 7248 www dometic com Page 19 of 20 Freightliner Refrigerator Troubleshooting Guide Dometic 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 dangerous gas or vapor could exist If a unit is installed in such a manner that allows potentially lethal gases or vapors to be discharged by the air handling unit into the living space this could result in loss of life Maximum protection against the introduction of dangerous gases or vapors into living spaces can be obtained through the introduction of clean air into the living space Bear in mind that the advent of air conditioning whether it is for cooling or for heating naturally leads to the practice of closing a living space tightly Never close all windows and doors unless auxiliary ventilating systems which introduce clean outside air into the living space are used Always leave enough window and door openings to provide adequate ventilation in the event potentially lethal gases or fumes should escape from any source Note Never sleep in any closed area when any equipment which functions as a result of the combustion of a volatile fuel is in operation such as engines generators power plants or oil fired heaters etc At any time the exhaust system of such devices could fail resulting in a build up of LETHAL gases within the closed area DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 15299 I Richmond VA 23227 USA Phone 82. Refrigerator components utilize R134a refrigerant R409A or R404A R125 R143a R134 44 52 47 which are non toxic nonflammable gases however these gases contain no oxygen and will not support life Refrigerant gas tends to settle in the lowest areas of the compartment If you experience a leak evacuate all personnel and ventilate area Do not allow open flames in the area of leaks because refrigerant gas when burned decomposes into other potentially LETHAL gases Refrigerant components operate at high pressure and no servicing should be attempted without gloves long sleeved clothing and eye protection Liquid refrigerant can cause severe frost burns to the skin and eyes VENTILATION Dometic Refrigerator components are designed to move air through a heat exchanger by a blower or propeller fan This design necessarily produces a suction on one side of the air handling component and a pressure on the other side Air handling components must be installed so that the suction pressure action does not 1 pressure an area to the extent that structural failure occurs which could cause harm to occupants or bystanders or 2 cause a suction or low pressure in an area where hydrogen gas from batteries raw fuel vapor from fuel tanks carbon monoxide from operating propulsion engines power generators or heaters methane gas from sewage holding tanks or any other DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 15299 I Richmond VA 23227 USA
3. 04 746 1313 Fax 804 746 7248 www dometic com Page 20 of 20
4. 116 117 119 121 123 124 125 126 127 129 130 135 DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 15299 I Richmond VA 23227 USA Phone 804 746 1313 Fax 804 746 7248 Service Part 3311370 000 3310735 000 3311359 000 3311360 000 3311363 000 3311454 000 3311368 000 3311369 000 3311372 000 3311373 000 3311378 000 3311380 000 3311462 000 3311445 000 3311469 000 3311362 000 3311365 000 3311366 000 3311465 000 3311466 000 3311467 000 3312372 000 www dometic com Dometic Description b THERMOSTAT KIT b KIT WARNING DECAL b TRAY KIT FAN KIT bk RETAINER KIT b FRAME KIT TJ22F MODULE KIT DANFOSS b RESISTOR KIT bk HOUSING KIT THERMOSTAT b LIGHT KIT b SHELF KIT b HINGE KIT bk GUIDE KIT DOOR TRUCK y DOOR KIT TJ22 TRUCK y PANEL KIT TJ22 b SHELF KIT WIRE b DOOR KIT FREEZER PAN KIT DRAIN bk LOAD DUMP KIT b LATCH KIT y LATCH KIT bk HARNESS KIT FREIGHTLINER 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 Page 18 of 20 Freightliner Refrigerator Troubleshooting Guide Dometic 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 WARNING Dometic Corporation Environmental Division Dometic manufacturers of Dometic Refrigerator products makes the following safety warnings concerning the application installation use and care of its products Although these warning
5. 17V the electronic unit assumes that it is working in a 12V system If the voltage is higher than 17V the electronic unit assumes that it is working in a 24V system However the compressor does not run at power supply voltages between 17V and 22 8V the desired battery protection cut out voltage for 24V systems Protection Systems The Danfoss compressor protection system facilitates protection against compressor overload and start failure fan overload and electronic unit overheating as well as destructive battery discharge When an overload protection is activated the compressor enters a cycle in which it makes start attempts at approximately 60 second intervals until a successful start is achieved DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 15299 I Richmond VA 23227 USA Phone 804 746 1313 Fax 804 746 7248 www dometic com Page 11 of 20 Freightliner Refrigerator Troubleshooting Guide Dometic 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 Overload Protections The compressor overload and start protection cuts off power to the compressor if the compressor speed drops below approximately 1 900 rpm or if this motor speed is not reached during the start sequence Possible reasons for overload protection activating could be too high refrigeration system pressures during operation or lack of pressure equalizing at Start The fan overload protection stops the compressor if the fan current exceeds 0 5 A avg o
6. 3311377 000 3311380 000 3311462 000 3311443 000 3311468 000 3311361 000 3311364 000 3311366 000 3311465 000 3311376 000 3311466 000 3311467 000 3312372 000 www dometic com Dometic Description b THERMOSTAT KIT b KIT WARNING DECAL b TRAY KIT FAN KIT bk RETAINER KIT b FRAME KIT TJ18F bk MODULE KIT DANFOSS b RESISTOR KIT bk HOUSING KIT THERMOSTAT b LIGHT KIT b SHELF KIT b HINGE KIT bk GUIDE KIT DOOR TRUCK y DOOR KIT TJ18 TRUCK y PANEL KIT TJ18 b SHELF KIT WIRE b DOOR KIT FREEZER PAN KIT DRAIN bk LOAD DUMP KIT b SHELF KIT y LATCH KIT bk LATCH KIT bk HARNESS KIT FREIGHTLINER 750000005 TJ18F 730000011 T J22F 750000026 TJ18FP3 Page 16 of 20 Freightliner Refrigerator Troubleshooting Guide Dometic 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 2 2 CF Compressor Refrigerator Service Part Identifier Illustration 121 Only parts with identifiers are available as replacement parts and these will Revision A vary from model to model See specific model number listing for service parts 3312424 000 4 03 08 This drawing illustrates model TJ22F DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 15299 I Richmond VA 23227 USA Phone 804 746 1313 Fax 804 746 7248 www dometic com Page 17 of 20 Freightliner Refrigerator Troubleshooting Guide ID 14 100 101 103 107 109 110 112 113
7. 99 I Richmond VA 23227 USA Phone 804 746 1313 Fax 804 746 7248 www dometic com Page 10 of 20 Freightliner Refrigerator Troubleshooting Guide Dometic 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 D The Refrigerant Circuit 1 If the refrigerator seems to be running properly and passes all of the above tests and there is no cooling in the unit then the problem may be a refrigerant leak 2 Do not attempt to charge unit in field Contact your service dealer or Dometic Corporation at 804 764 1313 or 1 800 234 8778 Ask for the service department ELECTRICAL CONNECTION Before connecting the appliance to the power supply check that the line voltage corresponds to the indications on the appliance rating plate and those of the compressor plate This appliance complies with the EC directive 89 336 governing radio suppression DC Wiring For Direct Current DC refrigerators connect the appliance to the DC distribution center A circuit breaker of 15 Amps maximum must be used if the system is 12VDC Make sure that proper polarity is maintained at all times Check that all grounding systems are in good working order The appliance must be wired and grounded in accordance with the Electrical Wiring Guidelines in this manual DANFOSS Compressor Data Voltage Range 12V systems From 10 4V to 17V The electrical unit will calibrate automatically to the applied voltage This means that if the battery voltage is less than
8. A CD CD CO EEoonunmrmriomotnZ skoo mog FK YR mDj EOEUEUOormurmrm mq RID BJ PJ me b CD Ch OC Cm DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 15299 I Richmond VA 23227 USA Phone 804 746 1313 Fax 804 746 7248 www dometic com Page 14 of 20 Freightliner Refrigerator Troubleshooting Guide Dometic 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 1 8 CF Compressor Refrigerator Service Part Identifier Illustration D am i I eo i er A OF E We a ef N Pei ee ww a a SG 2G See Hos ey Ju NL Weg ii FB A Li fu me ft ih Fn gt Only parts with identifiers are available as replacement parts and these will Revision A vary from model to model See specific model number listing for service parts 3311821 000 3 25 08 DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 15299 I Richmond VA 23227 USA Phone 804 746 1313 Fax 804 746 7248 www dometic com Page 15 of 20 Freightliner Refrigerator Troubleshooting Guide ID 14 100 101 103 107 109 110 112 113 116 117 119 121 123 124 125 126 127 128 129 130 135 DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 15299 I Richmond VA 23227 USA Phone 804 746 1313 Fax 804 746 7248 Service Part 3311370 000 3310735 000 3311359 000 3311360 000 3311363 000 3311451 000 3311368 000 3311369 000 3311371 000 3311373 000
9. Freightliner Refrigerator e e e 0 Dometic Troubleshooting Guide For DOMETIC CORPORATION ENVIRONMENTAL DIVISION 750000005 TJ1SF P O Box 15299 I Richmond VA 23227 USA 750000011 TJ22F Phone 804 746 1313 Fax 804 746 7248 750000026 T J1SFP3 WWW dometic com Before initiating troubleshooting the following equipment is recommended Multimeter 20 gauge min wires to use as jumpers and 12Vdc source Before applying power stand unit upright for a minimum of 1 hour to allow compressor oil to settle NOTE Although Dometic states on the packaging to always keep unit upright we cannot control how the carrier handles our boxes This also applies 1f the unit has been set on its side to affix any accessories If there are any questions please contact our warranty and service department at 1 800 234 8778 or 804 764 1313 Load dump Cap Tube l including Expansion Device Condenser Coil Power Input Refrigerator Components vafa ub d TED ITI y Danfoss Condenser Module P Cooling Fan Strainer Freightliner Refrigerator Troubleshooting Guide Dometic 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 Locating the Dataplate There are two Dataplates bearing the model number serial number and technical data One is located on the right side panel inside the appliance fig 1 and the other is located on the back of the unit fig 2 Figure The first three digits of the serial n
10. OCATED ON FAR SIDE OF BOARD DANFOSS ELECTRIC MODULE LOAD DUMP CIRCUIT BOARD CONNECTS DIRECTLY TO DANFOSS ELECTRIC MODULE AT TOP THREE CONNECTORS 12 24 VOC Negative 12 4 WC Poezie 7 RESISTOR PASSED DIELECTRIC 3309070 005 E E DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 15299 I Richmond VA 23227 USA Phone 804 746 1313 Fax 804 746 7248 www dometic com Page 13 of 20 Freightliner Refrigerator Troubleshooting Guide Dometic 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 Electrical Wiring Guidelines Direct Current ABYC Guideline E9 below meets or exceeds Trucking Industry Standard SAE J1292 Conductor Sizes for 3 Percent Drop in Voltage Length of Conductor from Source of Current to Device and Back to Source Feet 10 15 20 25 30 40 50 60 70 g 80 100 110 120 130 140 150 160 170 TOTAL CURRENT ON CIRCUIT IN AMPS 2 10 15 20 25 30 40 50 60 70 80 90 100 ok 50 e SS So tm 2550 ska BEER oanwvan BO BO amp d amp B CO C 00 08 5 C3 RO Ch E im ca ERO RBS PJ BD E c CO Oh CD Co M M BO De de CD OO OS ns C O BO RO amp fi Ch CD Cm d dZg PCIAONN BeOS En c 24 Volts 3 Drop Wire Sizes gauge Based on Minimum CM Area 16 12 10 10 8 8 6 6 4 4 4 2 2 i e B k k C Ee c B3 M3 BO de e CD C OD Cj 250 E E pe D CO a H A x
11. VISION P O Box 15299 I Richmond VA 23227 USA Phone 804 746 1313 Fax 804 746 7248 www dometic com Page 9 of 20 Freightliner Refrigerator Troubleshooting Guide Dometic 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 Compressor terminals Current lead in pins 4 Check each pin motor winding for continuity to ground A multimeter can be used in some cases but an insulation tester by Meggar should be used If there is any continuity to ground then the compressor is internally shorted and will need to be replaced This is not a field operation 5 Ifa problem is not found in the compressor then the Danfoss module needs to be replaced C Checking the Fan 1 The Condenser Cooling Fan should come on after a five second delay once the compressor starts 2 Visually inspect fan for any blockages and make sure that it can turn freely 3 If the fan can spin freely and is not working then first check the fan terminals the lower of the two symbols and F on the module for voltage The reading should be approximately 12 volts Condenser fan terminals Current lead in pins 4 If there is voltage at the module terminals then remove the fan wires from the module and check for continuity through the fan itself by placing meter leads in each fan wire push on terminal If there is no continuity through the fan then replace it DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 152
12. electrical wiring guidelines in this manual B All connection points in the power circuit are properly tightened and secure C There are no signs of oxidation on the battery poles or contact points and the battery 1s properly maintained 6 Insure the LOAD DUMP module is installed properly on the Danfoss Module The three pins on the LOAD DUMP module must line up with the top three pins of the Danfoss Module DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 15299 I Richmond VA 23227 USA Phone 804 746 1313 Fax 804 746 7248 www dometic com Page 3 of 20 Freightliner Refrigerator Troubleshooting Guide Dometic 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 LOAD DUMP Module DANFOSS Modul P odule 7 The battery is delivering sufficient power If the power voltage is less than 10 4 VDC the unit will not operate Check incoming voltage with multimeter by putting the black lead on the negative terminal of the LOAD DUMP module and the red lead on the positive terminal as shown Unit must be running to check this function Negative lead from multimeter Positive Lead from Multimeter 8 If 12 volts are available to the unit as shown in step 7 check to see if the LOAD DUMP module is defective This module is used as a surge protector for the unit Removed the module from the unit and remove all wires Wire the Danfoss module as shown with the wires that were on the LOAD DUMP modu
13. he load dump module The red lead from the multimeter is held to the terminal and black lead from the multimeter is held to the terminal You should read positive voltage If the reading is negative check DC polarity If it is reversed correct wire connections 2 The inrush current must not drop the voltage more than 3 or 36 volts when the compressor 1s initially energized Monitor this voltage by using a multimeter at start up For 12vdc system the cutout is around 10 4 volts and the cut in is 11 7 volts If there is a drop in current at start up below the cut out voltage then the compressor will not operate A drop in voltage will occur if the wire size 1s too small or poor connection 3 Verify that voltage at unit is equal to voltage at source If the voltage is less than at the source then the wire used from source to unit is too small B Checking the Compressor 1 Remove all wires from compressor module make note where they are connected 2 Removed Danfoss module from the compressor by removing the mounting screw and twisting the module to the rear to disconnect it from the compressor See Section A 12 in General Troubleshooting Section 3 Compressor windings can be checked for defects by measuring the resistance on the current lead in pins If the measured values between all pins are approximately the same approximately 2 2 2 5 ohms The compressor motor is OK DOMETIC CORPORATION ENVIRONMENTAL DI
14. l tube or a screw driver position on the compressor and your ear may help you hear the compressor motor when energized If fan is running but the compressor kicks on and off or the compressor is not running change the Danfoss module see Section A 12 If problem persists it may indicate the compressor is bad or a refrigerant leak 7 The inside temperature needs to be around 34F to 40F If the temperature starts in this range but increases over time put the refrigerator on a test bench start it let it run for an hour and check the Cap Tube Strainer Assembly located in the back of the unit Look for condensation and or ice accumulations as illustrated in the following pictures dL z uer qupd Qua coc c L eas M io rte mener P B e e ee A 1 Ate vhs 2 EMT Us T e j af s y ws 4 Ice accumulation around the cap Water condensation around strainer tube usually indicates blockage usually indicates moisture in the system If condensate or ice accumulates in these areas replace unit DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 15299 I Richmond VA 23227 USA Phone 804 746 1313 Fax 804 746 7248 www dometic com Page 8 of 20 Freightliner Refrigerator Troubleshooting Guide Dometic 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 Specific Trouble Shooting of Electrical Components A Check incoming voltage 1 Hold multimeter leads to the positive and negative terminals of t
15. le See Wiring Diagram in the later sections LOAD DUMP DANFOSS Module Module DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 15299 I Richmond VA 23227 USA Phone 804 746 1313 Fax 804 746 7248 www dometic com Page 4 of 20 Freightliner Refrigerator Troubleshooting Guide Dometic 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 The LOAD DUMP module is defective if the unit operates while wired to the DANFOSS module Replace Load Dump module 9 If LOAD DUMP module is working properly check the speed resistor This component is used to control the speed of the compressor and is located on the T terminal of the DANFOSS module Speed Resistor Turn off power and disconnect the speed resistor from the Danfoss module Remove the speed resistor from the blue wire and connect the blue wire on the Danfoss module terminal T where the speed resistor was removed Connect power 12volts back to the unit If the unit performs the speed resistor is faulty Replace Speed Resistor 10 Test the Thermostat Circuit Remove the blue wire that is connected on terminal C and remove the black Speed resistor attached to the other blue wire connected to terminal T of the Danfoss module These two wires represent the thermostat circuit Blue Wire from thermostat Speed Resistor connected to other blue wire from thermostat Make sure the thermostat knob is turned on remove the speed re
16. nit from its source of energy by disconnecting the power before performing the following procedure A Remove all wires from compressor module and load dump make note where they are connected B Removed Danfoss module from the compressor by removing the mounting screw and twisting the module to the rear to disconnect it from the compressor C Use screw driver to pry connector from compressor terminals Use caution D If changing the Danfoss module does not fix the problem this may indicate the compressor is bad DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 15299 I Richmond VA 23227 USA Phone 804 746 1313 Fax 804 746 7248 www dometic com Page 7 of 20 Freightliner Refrigerator Troubleshooting Guide Dometic 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 B Insufficient Refrigerating Capacity Check 1 The door is sealed properly and the refrigerator 1s not positioned close to heat sources 2 Ice build up in and on freezer compartment 1 8 maximum Defrost Freezer by turning power off and let ice melt Do not chip ice off freezer compartment because freezer plate can be damaged 3 The refrigerator is sufficiently ventilated 4 Dust has not blocked the condenser ventilation sources 5 The Condenser Cooling Fan rotates freely 6 The compressor and fan are operating properly The compressor is very quiet during operation so it may be difficult to ascertain if it is running A meta
17. r 1 A peak An overheating of the electronic unit heat sink will cause the compressor to stop Restart will occur automatically when a normal temperature has been reached If a fan 1s installed it will continue to run when the compressor stops due to overload or electronic unit overheating Voltage Protection If a voltage outside any concerned range 1s applied to the electonic unit the compressor does not start or it stops if the voltage limit 1s exceeded during operation The compressor will restart automatically approximately 1 minute after the supply voltage has reached the reset voltage within the range in question Battery protection The Danfoss electronic unit provides protection as follows Standared Battery Protection Settings 12V cut out 12V cut in 10 4 11 7 Final Installation Notes For all appliances AVOID the use of any electrical adapters or extension cords After installation allow the appliance to sit for at least one hour before starting The manufacturer assumes no responsibility for any injuries or damage caused by noncompliance with any of the installation regulations DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 15299 I Richmond VA 23227 USA Phone 804 746 1313 Fax 804 746 7248 www dometic com Page 12 of 20 Freightliner Refrigerator Troubleshooting Guide O Dometic 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 TJ18F TJ22F WIRING DIAGRAM LOAD DUMP CIRCUIT BOARD L
18. s are extensive there may be specific hazards which may arise out of circumstances which we have not outlined herein Use this as a guide for developing an awareness of potential hazards of all kinds Such awareness will be a key factor in assuring your SAFETY and comfort ELECTRICITY Many Dometic products operate on 115 or 230 volt AC power and or 12 24 volt DC power Such voltages can be LETHAL therefore the chassis cabinets bases etc on all components must be grounded together and connected to the vehicle s grounding system Sparks can occur as switches thermostats and relays open and close in the normal operation of the equipment Since this is the case ventilating blowers for the removal of hazardous fumes or vapors should be operated at least 5 minutes before and during operation of any Dometic product or group of Dometic products All electrical connections must be covered and protected so accidental contact cannot be made by persons using the equipment as such contact could be LETHAL ELECTROLYSIS Electrical leakage of any component can cause electrolytic deterioration electrolysis resulting in vehicle component damage which could cause loss of life All Dometic components must be kept clean and dry and checked periodically for electrical leakage If any electrical leakage is detected the component should be replaced or the fault causing the leakage corrected before the component is put back into service GAS Dometic
19. sistor set multimeter to check continuity and connect meter leads to these wires as shown DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 15299 I Richmond VA 23227 USA Phone 804 746 1313 Fax 804 746 7248 www dometic com Page 5 of 20 Freightliner Refrigerator Troubleshooting Guide Dometic 11 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 Thermostat knob lead connections If the thermostat is working correctly the multimeter should indicate continuity In addition check the speed resistor with the multimeter This resistor is used to set the compressor motor speed Connect multimeter leads to either end of resistor assembly and set meter to resistance Q This is a 277 ohm resistor It should read between 265 and 280 ohms An additional test to use if a multimeter is not available Turn the unit off and disconnect both blue wires that were connected to the Danfoss module terminals T and C Place the jumper wire across these terminals as illustrated Energize unit and if unit operates this action indicates the problem may be a bad thermostat Replace thermostat DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 15299 I Richmond VA 23227 USA Phone 804 746 1313 Fax 804 746 7248 www dometic com Page 6 of 20 Freightliner Refrigerator Troubleshooting Guide Dometic 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 Change DanFoss Module Isolate u
20. umber indicate the Year and Week of manufacture Example the Dataplate above has a serial number of 71305899 7 Year 2007 13 13 week of the year 05899 Sequential Unit Number TROUBLE SHOOTING The guidelines are arranged sequentially and should be followed in order until the problem is solved Start with General Trouble Shooting sections A and B then go to Specific Trouble shooting of Electrical Components start with section A and work systematically to section D DOMETIC CORPORATION ENVIRONMENTAL DIVISION P O Box 15299 I Richmond VA 23227 USA Phone 804 746 1313 Fax 804 746 7248 www dometic com Page 2 of 20 Freightliner Refrigerator Troubleshooting Guide Dometic 750000005 TJ18F 750000011 TJ22F 750000026 TJ18FP3 General Trouble Shootin A Appliance Does Not Operate Check 1 The thermostat knob is ON and turned at least half way 2 The electrical system circuit breaker for the refrigerator is ON 3 The fuse between the Danfoss Module electronic control unit and the power source is good 4 The power supply cable is not faulty loose or poorly connected 5 The voltage on the Load Dump module corresponds to that of the battery If there is a voltage drop of 0 2 0 4v check Positive Lead Negative lead from 1S Cae from EN Multimeter aq multimeter A The size of the cable connecting the battery to the Load Dump module corresponds to specifications see
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