TM 5-3805-262-20
3-24. ACCESSORIES TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
8. DEFROSTER MOTOR DOES NOT OPERATE (Cont).
S t e p 8 . ( C o n t ).
b. If 24 volts obtained, turn ignition key switch to off position.
Remove defroster motor (page 10-52) and perform continuity check
of motor and resistor (page 10-55). If continuity not obtained,
r e p l a c e d e f e c t i v e p a r t.
9. BOTH REAR DEFOGGER FANS DO NOT OPERATE.
Step 1.
Turn ignition key switch to on position.
Turn FRONT WIPER switch to H position.
Windshield wiper should operate.
a. If windshield wiper does not operate, go to step 2 below.
b. If windshield wiper operates, go to step 5 below.
Step 2.
Press 5 ampere circuit breaker located on right instrument panel.
Check if windshield wiper and rear defogger fans operate.
a. If both windshield wiper and defogger fans operate, problem was
momentary short in circuit . If circuit breaker blows again,
problem is in circuit associated with circuit breaker.
Disconnect wires from circuit breaker, one at a time to isolate
problem to associated circuit: a u x i l i a r y s t e e r i n g , i n s t r u m e nt
panel cluster (located on left instrument panel), voltmeter, cab
relay solenoid, or electric fuel pump.
b. If windshield wiper and defogger fans do not operate and circuit
breaker did not blow, go to step 3 below.
3-173
