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Lab # 6 Work Orders, Vehicle Identification, Fuses, and Volt Drop

1. _ Battery Positive Battery Negative both meter leads on battery ground Headlamp on LO Positive wire w Headlamp on LO ground wire Headlamp on HI Positive wire Headlamp on HI ground wire Page 3 of 5 Calculate volt drop for the headlamp wiring Note One of the 3 headlamp wires will share current in BOTH high and low beam Low Beam battery Positive terminal to headlamp Positive terminal Low Beam battery Negative terminal to headlamp Ground terminal High Beam battery Positive terminal to headlamp Positive terminal High Beam battery Negative terminal to headlamp Ground terminal NOTE to find volt drop in positive wires subtract the voltage at the headlamp positive wire from the voltage at the battery positive terminal MAKE SURE headlamps are ON when testing voltage at the positive battery terminal Answer these questions to the instructor refer to the sample headlamp wiring diagram a How can you directly measure volt drop instead of having to calculate volt drop b What causes Voltage Drop in the positive wires leading to the headlamps c What causes Voltage Drop in the headlamp ground circuit d What would happen if you measured Voltage Drop with the headlamp connector unplugged e If the headlamp ground wire was to corrode or the ground contacts loosen up what would happen to the headlamps f If the headlamp ground wire was to corrode or the ground contacts loosen up what would happen to the voltage drop i
2. Name s Please limit lab groups to 2 students per vehicle Lab 6 Work Orders Vehicle Identification Fuses and Volt Drop 2013 NATEF tasks 277 278 280 281 287 Select any vehicle newer than 1983 Find and record VIN number To decode the VIN look up this vehicle in ALL Data or ShopKeyPro In ALL Data look for Application and ID on the right side of screen For directions on how to look up a vehicle in ShopKey Pro go to http elearning linnbenton edu mod page view php id 148917 requires moodle login In ShopKey search for VIN code ID or vehicle identification number Then look through the Tabs it is often found in the Add 1 tab Record the VIN digit that specifies the model year Record the VIN Digit that specifies the engine size _ What else will the VIN number tell you about this vehicle All modern vehicles require an emissions decal to be located in the engine compartment List out what the Emission Decal tells you about this vehicle on older vehicles this decal may be missing find one from any car for this question Why is it important to ensure the correct engine and year according to the VIN or Emissions Decal is recorded on the work order To complete a Work Order you will need this information Model Year _ _ Make Model _ _ Engine Size Build Date ___ Odometer Reading _ _ License Plate Instructor Check _ Page 1 of 5 FUSES and FUSIBLE LINKS NEVER install a fuse un
3. e for the Fusible link Instructor Check _ Page 2 of 5 Technical Service Bulletins Technical Service Bulletins TSB s are written by car manufacturers when they find a problem that often occurs in the type of vehicle you are working on TSB s can really help technicians quickly find the correction for commonly occurring problems ShopKeyPro lists all TSB s under SERVICE MANUAL gt Quick Lookups gt Technical Bulletins 1 Demonstrate how to search Technical Service Bulletins in ShopKey Pro 2 Locate any TSB s for the Headlamp or Exterior Lighting systems on your vehicle Instructor Check _ Use Volt Drop to find unwanted resistance Volt drop only happens when amps flow through resistance Why is it important to use a backprobe when testing for voltage drop What is wrong with unplugging a connector to see how many volts are available Locate the Headlamp systems wiring diagram for your vehicle List the wire color for each headlamp do not hesitate to get help with this NOTE most headlamps use one wire to supply either Positive or Ground for both High and Low Beam Left Headlamp wire color Right Headlamp wire color Positive Low Beam Positive Low Beam Ground Low Beam Ground Low Beam Positive High Beam Positive High Beam Ground High Beam Ground High Beam Record voltage at headlamp for ONE side only with headlamps ON and engine OFF Keep Voltmeter negative lead on the Battery Ground for ALL volt drop tests
4. less you are certain of the proper amp rating Do not assume the fuse you remove is the proper rating The fuse panel cover may have amp ratings for each fuse however you often have to look this up to be sure you use the proper fuse Fuse information can be easily located in ShopKey by searching for power distribution In ShopKey figure out what each of these Tabs tell you about the power distribution Descriptions Locations Procedures Diagrams Add l Articles There are often Cautions or Warnings for working on the Power Distribution system Find and be prepared to discuss these service precautions NOTE If your vehicle has none search power distribution for a 1992 Jeep Cherokee 4 0L Laredo 2 Demonstrate how to find the proper amp rating for fuses fuse locations what circuits a fuse will protect and discuss the power distribution wiring diagram 3 Locate a fuse panel turn the key to the run position and check the voltage reading at each end of the fuses A Use a 12 volt test lamp to test these same fuses 5 Older vehicles use wire fusible links Discuss with your instructor how a fusible link works what is special about the insulation and how to properly solder new fusible links 6 Locate a fusible link in your vehicle Newer vehicles may not use wire fusible links If your vehicle does not have one find fusible links for a 2000 Dodge Caravan Demonstrate Fuse Link location and replacement wire gaug
5. n the headlamp ground feed g What would happen if there was a short to ground at various locations Instructor Check _ To complete this lab go to the Online Lab Work Order and completely fill out all vehicle information and NATEF information E mail this work order to your instructor List each NATEF task number found at the beginning of this lab and explain what you did to practice each specific NATEF skill http cf linnbenton edu eit auto krolicp upload Lab_6_WO_good pdf The above link shows how your work order should look for all your labs http cf linnbenton edu eit auto krolicp upload Lab_6_WO_not_good pdf This link shows common mistakes students make when filling out the lab work order A typical head lamp wiring diagram is on page 5 for use with discussing series parallel unwanted resistance volt drop and what happens when wires short at various locations Page 4 of 5 Sample Headlamp Circuit HOTATALL TIMES HOT AT ALL TIMES ENGINE COMPARTMENT FUSE BOX LEFT SIDE OF ENGINE COMPARTMENT ON TOP OF FRONT WHEELWELL SWITCH MULTI 4 FUNCTION SWITCH 2 A INSTRUMENT f CLUSTER HI BEAM INDICATOR BEHIND BOTTOM LEFT FRONT OF ENGINE RIGHT FRONT OF OF RIGHT COMPARTMENT ON UPPER ENGINE COMPARTMENT KICK PANEL RADIATOR SUPPORT ON FENDER APRON Page 5 of 5

Lab # 6 Work Orders, Vehicle Identification, Fuses, and Volt Drop

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