TM-9-2320-283-20-1

TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1

TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3

DECEMBER 1983

TM-9-2320-283-20-1 - Page 213 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

30.

PARK BRAKE LAMP NOT WORKING (Continued).

4.

Check for voltage at

12-volts dc Go to step 5.

Repair circuit

circuit 44F-LB ter-

nominal.

44F-LB (para

minal of park brake

3-127).

pressure switch.

NOTE

• Park brake control must be pulled when doing the following checks.

• With negative lead connected to a good ground, use positive lead to check for voltage.

5.

Check for voltage at

12-volts dc Go to step 6.

Replace switch

circuit 53D-GY ter-

nominal.

(para 3-108).

minal of park brake

pressure switch.

6.

Check for voltage at

12-volts dc Go to step 7.

Replace cir-

circuit 53D-GY ter-

nominal.

cult 53D-GY

minal of park brake

(para 3-127).

indicator lamp.

NOTE

With positive lead on circuit 53D-GY, check ground with negative lead when

doing the following checks.

7.

Check for voltage at

12-volts dc

Replace bulb

Clean and/or

park brake indicator

nominal.

(para 3-87).

tighten connec-

lamp.

tion.

2-88