TM 5-3805-262-203-24. ACCESSORIES TROUBLESHOOTING (CONT) MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1. AIR HORN DOES NOT SOUND WHEN HORN VALVE DEPRESSED (Cont).S t e p 2 . ( C o n t ).Tell assistant to start engine and allow air pressure to build up asindicated by AIR PRESS gage indication.Pressure gage installed in tee fitting shall indicate a minimum of85 psi.a. If pressure gage indicates a minimum of 85 psi, shut off engineand replace and repair horn valve (page 10-2).b. If pressure gage does not indicate a minimum of 85 psi, replacepressure protection valve (page 7-64).2. WINDSHIELD WIPER MOTOR DOES NOT OPERATE.Step 1. Turn ignition key switch to on position.Pull HEATER FAN switch on cab switch panel out.Check if heater fan is on.a. If heater fan is not on, go to step 2 below.b. If heater fan is on, go to step 5 below.Step 2.Press 5 ampere circuit breaker located on right instrument panel.Check if windshield wiper and heater fan operate.a .If both windshield wiper and heater fan operate, problem wasmomentary 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 isolatep r o b l e m t o a s s o c i a t e d c i r c u i t : 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 ntpanel cluster (located on left instrument panel), voltmeter, cabrelay solenoid, or electric fuel pump.3-159
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