TM-9-2320-285-24-1
TRUCK TRACTOR, YARD TYPE, 43,500 LB GVW, DED, 4X2, ARMY MODEL M878A1
TECHNICAL MANUAL; ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1985
TM-9-2320-285-24-1 - Page 194 of 987
TM 9-2320-285-24-1
2-18.
STARTING SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
ENGINE WILL NOT START (Cont)
Step 7.
Perform solenoid and 70 AMP circuit breaker on-vehicle tests (para 2-25a).
a.
If tests do not indicate parts are defective, go to step 8 below.
b.
If tests indicate parts are defective, repair or replace (para 2-25b).
Step 8.
Perform starter on-vehicle tests (para 2-25b).
a.
If tests indicate parts are defective, replace (para 2-25b).
b.
If tests do not indicate parts are defective, notify direct support maintenance.
2.
STARTER CRANKS CONTINUOUSLY
Step 1.
Connect voltmeter leads to starter solenoid control terminal (tan/green electrical lead) and to
ground.
Turn key switch to on position.
a.
If voltmeter indicates 12-14 Vdc, go to step 2 below.
b.
If voltmeter indicates zero volts, notify direct support maintenance.
Step 2.
Disconnect tan/brown electrical lead from key switch ST terminal.
Turn key switch to on position.
Check if starter cranks.
a.
If starter cranks, check for short in starting system wiring; repair or replace as necessary (para 2-
25a).
b.
If starter does not crank, replace ignition switch (para 2-26a(1)).
2-171
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