4-14. 12-VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
8. REAR SIDE MARKER LIGHTS AND REAR MARKER LIGHTS DO NOT OPERATE.
Tools and Special Tools
Tool Kit, General Mechanic's: Automotive
(Item 50, Appendix J)
Multimeter (Item 28, Appendix J)
Engine OFF, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
Parking brake applied, (TM 9-2320-364-10)
Locknut (Item 31, Appendix I)
12 vdc cable assembly connected to truck,
All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.
Truck electrical system OK.
on Page 4-187
All other trailer lights operate.
REASON FOR QUESTION
Are 10 to 14 vdc measured on
If voltage is not measured on
front junction box assembly
Front junction box assembly
front junction box assembly,
at terminal 22?
rear side marker light and rear
Wire 1012B-22 faulty.
marker lights will not operate.
Rear junction box assembly
Replace front junction
Verify repair, go to
Step 3 of this Fault.