AUXILIARY LIGHT BAR MARKER LIGHTS AND TAILLIGHTS DO NOT OPERATE.

TM 9-2330-385-14

4-13. 24-VOLT ELECTRICAL SYSTEM TROUBLESHOOTING (CONT).

11. AUXILIARY LIGHT BAR MARKER LIGHTS AND TAILLIGHTS DO NOT OPERATE.

INITIAL SETUP

Tools and Special Tools

References

Tool Kit, General Mechanic's: Automotive

TM 9-2320-364-10

(Item 50, Appendix J)

Multimeter (Item 28, Appendix J)

Equipment Condition

Engine OFF, (TM 9-2320-364-10)

Personnel Required

24 vdc cable connected to truck, (Para 2-9)

Two

Parking brake applied, (TM 9-2320-364-10)

Wheels chocked, (TM 9-2320-364-10)

NOTE

The following troubleshooting procedures need to be performed if extended drawbar/light bar kit has been

installed.

All electrical wires and components listed in this troubleshooting procedure are illustrated and located in FO-1.

START

TEST OPTIONS

KNOWN INFO

WARNING

Read WARNING

Voltage test.

Truck electrical system OK.

on Page 4-117

All other tracter lights operate.

REASON FOR QUESTION

POSSIBLE PROBLEMS

If 22 to 28 vdc are not present at

Are 22 to 28 vdc measured at

auxiliary light bar 24 vdc cable

Auxiliary light bar 24 vdc

terminal E and D on rear

terminal E, lights will not

cable faulty.

crossbrace end of 24 vdc

operate.

cable?

Replace auxiliary light

bar 24 vdc cable,

(Para 4-30).

Verify repair, go to

Step 2 of this Fault.

YES

4-116