4-13. 24 VOLT ELECTRICAL SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
9. REAR SIDE MARKER LIGHTS, REAR MARKER LIGHTS AND TAILLIGHTS DO NOT
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)
24 vdc cable assembly connected to truck,
Locknut (Item 31, Appendix I)
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.
Truck electrical system OK.
on Page 4-103
All other trailer lights operate.
REASON FOR QUESTION
If voltage is not measured on
Are 22 to 28 vdc measured on
front junction box assembly,
Front junction box assembly
front junction box assembly
power is not supplied to lights
at terminal 21?
and rear side marker light, rear
Wire 1008C-21 faulty.
marker lights, and taillights will
Rear junction box assembly
Replace front junction
assembly (Para 4-25).
Verify repair, go to
Step 4 of this Fault.