Ch 7. Electrical System - the OLD TOWN FERNANDINA Website
Contents
1. O BATTERY OF CIRCUIT BREAKER 40 AMP FUSE op RN amp BROWN R TRAILER CONTROLLER O GENERATOR NOTE Polarity of trailer battery must match polarity of car battery Spare 40 amp fuses should be carried e g If negative pole of car battery available at larger auto supply is grounded negative pole of trailer truck parts stores battery must be grounded electrical car connection schematic central control panel ELECTRICAL SYSTEM 67 con xu pito AHR Ad oor TWO o2. ELECTRICAL SYSTEM Your Airstream is equipped with the latest development in trailer electrical systems the exclusive AIRSTREAM UNIVOLT System This system enables you to use all your lights and appliances including the fans and water pump whether you are operating self contained on bat tery power or you are hooked up to 120 volt city power The UNIVOLT system converts 120 volt power to 12 volt power through a special high capacity combination 12 volt DC power supply and battery charger This combination unit contains all solid state circuitry and is protected from damage by internal automatic resetting circuit breakers The 12 volt light bulbs give the same light as you would expect from regular household bulbs Additional 120 volt AC convenience outlets are provided for operation of appliances such as T V toaster etc when trailer is hooked up to 120 volt city power Another feature of the UNIVOLT system is the CENTRAL CONTROL panel which is discussed later in this chapter LIGHTS The ceiling light fixtures are operated by 4 position switches located in the fixtures Starting from the off posi tion and turning clockwise the switch turns on first one bulb then three bulbs then four bulbs then off Naturally when operating on the battery you wish to conserve power so you will want to use only one bulb in the ceiling fix tures whenever possible The cone lights in the bedroom have individual 4 position switches f
3. the indicator lights may not work e gt e 2 a e ELECTRICAL SYSTEM central contrel component location gt e E lt Ge M grounding HOLDING TANK LEVEL standard on International models To determine the level of the holding tank press the button under the words HOLDING TANK The gt light will be on if the holding tank is at least one half full The full light will be on if the holding tank is over three quarters full POLARITY WARNING LIGHT There is a polarity light located on the CENTRAL CONTROL panel Whenever you hook up your trailer to 120 volts using an adapter which allows you to reverse the plug in the receptacle be certain that the polarity light is off If not reverse the plug which should cause the light to go off Occasionally when you are hooked up directly through the 3 prong grounding plug without any adapter the polarity light will glow As long as you are using the 3 wire system the trailer is adequately grounded and there is no cause for alarm POWER ON Whenever you are hooked up to 120 volt city power the POWER ON light will glow This light and the previously discussed polarity light are two excellent checks on a proper 120 volt connection LOCATION OF BASIC ELECTRICAL COMPONENTS The UNIVOLT is located at the rear curbside of the trailer just outboard of the tub It is accessible through the
4. ground lug This is your ground line b Clamp ground line to junction box or other ground such as a water pipe then insert two prong plug into the receptacle c After cord has been connected check the polarity indi cator light If the polarity warning light is on pull out the plug turn it over and reinsert The light will now be out the polarity will be correct and your Airstream electrical system will be grounded An excellent additional ground is obtained through the front jack if an aluminum or steel jack pad is used Do not block the jack pad with wood because this will eliminate this grounding feature TROUBLE SHOOTING Trouble with the electrical system in your trailer is ex tremely unlikely Your Airstream s UNIVOLT system and CENTRAL CONTROL are provided with a series of fuses and circuit breakers for your safety Should electrical diffi culties arise you will normally be able to locate the source of the problem and correct it with the aid of the following checklist and circuit diagrams More extensive trouble shooting instructions for the CENTRAL CONTROL are found in the CENTRAL CONTROL service manual For details on electric motor amperage light bulb size and fuse and circuit breaker location refer to charts found in chapter 15 The electrical diagram for your particular model Airstream is illustrated on one of the following pages We suggest that you cross out the diagrams which do not apply to
5. on International models Normally you will use the ammeter in conjunction with the battery condition tester so as to indicate whether the charge on the trailer battery is being increased or de creased When the battery condition is bad you will want to limit the battery drain shown by the ammeter to the lowest convenient level If you wish to operate the car engine to supply additional power from the auto generator to the trailer battery when the battery condition is bad you can tell from the ammeter whether or not the car is supplying sufficient current to prevent the trailer battery from being drained further WATER PUMP SWITCH The water pump switch in your Airstream is located on the CENTRAL CONTROL panel The indicator light above the Switch will be lighted when the water pump switch is on WATER LEVEL INDICATOR A matter of importance to you when you are operating self contained is the amount of water left in your water tank This can be determined by pressing the button under the words WATER LEVEL on the CENTRAL CONTROL panel When this button is pressed if the tank is at least half full the 15 light will be on if the tank is at least one quarter full but not one half full the V4 will on and if the tank is less than one quarter full the 96 light only will show If the 96 light does light the tank is almost empty In rare cases when tank has been filled with highly pure water such as from a mountain stream
6. rear curbside access door The 120 volt panel is located in the curbside of the front roof locker The low voltage panel is part of the CENTRAL CONTROL panel located in the center of the front roof locker The battery is located in the trunk compartment at the rear of the trailer It is mounted on a Z lt Le lt slideout rack for easy servicing When you are operating your trailer on 120 volt city cur rent the wiring is protected by circuit breakers in the 120 volt panel box In the event of failure of a 120 volt circuit check the circuit breaker first If the breaker con tinues to trip after you have reset it several times your circuit may be overloaded with appliances or there may be a short in the circuit If lessening the load on the cir cuit does not solve the problem consult an electrician In models with factory installed air conditioning separate 120 volt circuit with a separate circuit breaker is provided avoid possible overloading of the appliance circuits A feature of your AIRSTREAM trailer is the MULTI DOME system This is a system of removable panels in the ceiling of the trailer If there is ever the need these panels can be removed and would expose almost all of the 12 and 120 volt wiring in your trailer WHEN THREE WIRE GROUNDED SERVICE IS NOT AVAILABLE a Attach the three prong plug on your trailer power sup ply cable to a two prong adapter The third conductor line from the adapter has a
7. roof locker On the front face and behind this panel are various con trols connections and readout devices which will simplify the use of the various systems in the trailer Specific infor mation on servicing and trouble shooting can be found in control panel service manual Following are the various items located on the CENTRAL CONTROL panel PANEL LIGHT SWITCH This switch operates a light which illuminates the switch panel CLOCK This clock is operated by a cell battery which should last from 9 to 12 months To replace battery or reset time unlatch and open top panel BATTERY CONDITION TESTER standard on International models By pressing the button switch under the words BATTERY CONDITION the needle will indicate whether your battery is in good fair or bad condition When the needle shows good condition the battery is at 12 to 13 volts fair condi tion is 11 to 12 volts and bad condition is 10 to 11 volts When the battery condition is bad you should take every reasonable step to conserve power by using as few lights as possible and not operating any unnecessary appliances so as to be sure to have battery power remaining for such necessary functions as lights and the water pump This tester will give an accurate reading only when trailer is unhooked from 120 volt city power because when trailer is hooked up the battery is being charged by the UNI VOLT system and this gives a false reading AMMETER standard
8. e battery is fully charged shut off is complete it is impossible to overcharge BATTERY CHARGING AT SERVICE STATIONS If your battery needs charging and 120 volt power is acces ible we recommend using the automatic built in charger in your UNIVOLT system but if this is not possible and you must have the battery charged at a service station make certain they give the battery a slow charge since quick charge can drastically shorten the life of the battery Another practice that can shorten battery life is allowing it to completely discharge too many times BATTERY WARRANTY The battery in your Airstream is warranted for 24 months HOLDING TANK LEVEL INDICATOR LIGHTS es monem j INDICATOR LIGHTS S BATTERY CONDITION METER BATTERY CONDITION PANEL LIGHT SWITCH TEST SWITCH 120 POWER ON INDICATOR LIGHT 8887 inis POLARITY WARNING LIGHT 2 AMMETER WATER PUMP POWER ON HOLDING TANK LEVEL INDICATOR LIGHT INDICATOR SWITCH WATER PUMP SWITCH WATER LEVEL INDICATOR SWITCH TOP PANEL LATCH PANEL LIGHT SWITCH 120 POWER ON M WATER LEVEL INDICATOR INDICATOR LIGHT LIGHTS POLARITY WARNING LIGHT WATER LEVEL INDICATOR SWITCH WATER PUMP POWER ON INDICATOR LIGHT WATER PUMP SWITCH For service or replacement go to any service station or dealer who sells and services this brand CENTRAL CONTROL PANEL A feature of the Airstream UNIVOLT system is the CEN TRAL CONTROL panel located in the front
9. or each light fix ture which allows you to select any one of three different light levels TO OPERATE SELF CONTAINED The UNIVOLT system is automatically on self contained battery power whenever the trailer is disconnected from the city power In case you are connected to city power and wish to operate on self contained battery power all you need to do is disconnect the power supply cable from the city power receptacle Whenever this cable is not being used store it in the space provided on the hose storage compartment lid When the UNIVOLT system is on self contained battery power the only items which are inoperable are the 120 volt convenience outlets the electric operation of the re frigerator and the air conditioner if you have this optional accessory When your towing vehicle is hooked up to your Airstream the UNIVOLT system will automatically draw power from your vehicle battery as well as your trailer battery TO OPERATE WITH CITY POWER To operate the UNIVOLT system in your Airstream from 120 volt AC city power plug the power supply cable into the city power receptacle MAKE CERTAIN THAT THE TRAILER PARK SERVICE IS 120 VOLTS NOT 220 VOLTS NOTE You don t need to uncoil the total power supply cord Just open the storage compartment lid uncoil the needed amount of power cord pull this cord out through the access door on the bottom of the storage compartment and plug into city power It is necessary to ground the se
10. rcuit terminals while watching ammeter Ammeter will show discharge in the shorted circuit From wirlng diagrams check the circuit for defective wiring lamps or motors Replace battery and fuse Make proper connections replace fuse Connect to 120 volt 60 cycle power Replace battery Use 60 cycle power Charge battery Connect input line Connect battery to UNIVOLT Replace battery Reduce electrical load Add distilled water to battery POWER SUPPLY CORD APPLIANCE CIRCUIT electrical diagrams 12 VOLT 120 VOLT 20 T 230 25T LY APPLIANCE CIRCUIT POWER SUPPLY CORD m ELECTRICAL SYSTEM WATER PROOF OUTSIDE RECEPTACLE 25 D LY 27 T INTL 65 electrical diagrams Es bu gt e 54 EI POWER SUPPLY CORD HOOD FAN RANGE PPPLIANCE CIRCUIT SE CIRCUIT aM 222 LOW VOLTAGE DISTRIBUTION PANEL 12 VOLT 120 VOLT 27D LY 270 NTL 291290 311 310 NTL CENTRAL CONTROL PANE SCHEMATIC BE LOW MED CIRCUIT BOARD High T PROBE COM PANEL LIGHT O POWER ON 36 LEADS OC Ea I bes oues POLARITY 36 LEADS EE E E PUR T i METER SHUNT dj mil 2 CIRCUIT LOW HIGH F H T PROBE COM 12 D C AMMETER BATTERY COND CIRCUIT BOARD PANEL LIGHT POWER ON 36 LEADS POLARITY 367 LEADS CE El WATER PUMP WATER TANK TRAILER CAR ELECTRICAL CONNECTOR Hr
11. rvice coming into your Airstream to prevent a possible shock to anyone touching your trailer and as long as you are hooked into electrical service that accepts the three prong grounded plug you should not have a problem with polarity or grounding In older parks and many other loca tions you will not be able to tie into three wire grounded a e Li lt ELECTRICAL SYSTEM city power 99 battery charging e gt e nd e Cu service In this event follow the procedure outlined later in this section BATTERY CHARGING WHILE TOWING As you drive the battery in your Airstream and towing vehicle are under constant charge by your towing vehicle s generator or alternator The batteries cannot be over charged as the charge rate is controlled by your vehicle voltage regulator BATTERY CHARGING WHEN HOOKED UP TO 120 VOLTS When your Airstream is hooked up to 120 volt city power the UNIVOLT system automatically charges the trailer bat tery and towing vehicle battery if hooked up but the speed of this charge depends on how much power is being used for lights and appliances Normally the system will provide substantial current for lights and appliances while maintaining your battery at full charge condition The system incorporates a unique voltage sensing section in the charger circuit that automatically controls the charging current When th
12. your Airstream to insure future reference to the proper diagram grounding trouble shooting gt e m s E e m 63 trouble shooting k e gt e E lt GE e e E TT SYMPTOM No 12 volt power Lights appliances do not work Blown fuse Univolt automatic circuit breaker clicks on and off Dim lights or sluggish fan motor UNIVOLT will not charge battery Specific gravity of battery is too high over 1 275 POSSIBLE CAUSE Input line battery not connected Central control fuse blown Overloaded circuit over 40 amps Electrical short Shorted battery Battery terminals not properly connected to UNIVOLT and terminals Incorrect input line voltage such as 230 volts or improper cycle power Shorted battery 25 or 50 cycle power some 10 11 12 13 14 15 foreign countries Discharged battery when operating without 120 volt line Input line not connected Battery not connected Bad battery Battery is low on water REMEDY 1 10 12 12 13 Too many lights and appliances use 14 15 Make necessary connections See items 3 4 5 and 6 Turn off switches to reduce load Open cover of CENTRAL CONTROL and replace blown fuse Open cover of CENTRAL CONTROL disconnect power lead from circuit breaker and touch to individual ci
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