TM-9-2320-279-20-1

M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)

TECHNICAL MANUAL; MAINTENANCE INSTRUCTIONS; ORGANIZATIONAL MAINTENANCE, VOLUME 1 OF 3

TM-9-2320-279-20-1 - Page 208 of 985

TM 9-2320-279-20-1

Troubleshooting Malfunctions (Cont)

Table 2-9. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

ELECTRICAL SYSTEM (CONT)

1. STOPLIGHTS DO NOT WORK.

Step 1.

Check for burned out stoplight lamp or damaged stoplight.

Remove lamp (para 7-60) and replace lamp if burned out.

Replace damaged stoplight (para 7-62).

Step 2.

Check for loose or damaged electrical connections at stoplights and stoplight switches.

Tighten loose connections. Replace damaged connections.

NOTE

l

If service brake stoplights do not operate, go to Step 3.

.

If trailer hand brake stoplights to not work, go to Step 4.

l

If emergency tow stoplights do not work, go to Step 5.

Step 3.

Check for defective service brake stoplight switches. Start engine, build air pressure up to

100 to 120 psi (690 to 827 kPa). Shut off engine. Remove wires from service brake stoplight

switches. Press on brake pedal, check for continuity of service brake stoplight switches.

If no continuity, replace service brake stoplight switch(es) (para 7-46).

If continuity, go to Step 6.

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