4-14. 12-VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
9. ALL 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)
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 4-193
All other trailer lights operate.
REASON FOR QUESTION
If voltage is not measured on pin
Are 10 to 14 vdc measured
B on 12 vdc cable assembly, rear
12 vdc cable faulty.
on pin B on 12 vdc cable
side marker light and rear marker
Wire 1012-2 faulty.
lights will not operate.
Front junction box assembly
Repair 12 vdc cable
assembly (Para 4-31)
or replace 12 vdc
cable (Para 2-9).
Verify repair, go to
Step 3 of this