ELECTRICAL
4203781 First Edition 4-63
4
Troubleshooting
Glow Plug Circuit
Symptom: Glow plugs do not get hot.
Start Circuit
Symptom: Starter motor solenoid does not engage.
Symptom: Engine does not run.
Probable Cause Remedy
Faulty circuit breaker. Test 50A circuit breaker F3. (See “Thermal Circuit Breakers Test” on page 4-74.)
Faulty power circuit. Check continuity between 50A circuit breaker F3 and glow plug solenoid terminal.
Continuity must be indicated.
Faulty glow plug switch. Test glow plug switch. (See “Glow Plug Switch Test” on page 4-77.)
Faulty glow plug switch circuit. Check continuity between the glow plug switch and glow plug solenoid. Continuity must
be indicated.
Open glow plug solenoid ground circuit. Check continuity between glow plug solenoid terminal and ground. Continuity must be
indicated.
Faulty glow plug solenoid output circuit. With the glow plug switch in the ON position, measure voltage between glow plug output
terminal and ground. Voltage must be approximately 12 VDC.
Faulty glow plug solenoid. Replace glow plug solenoid.
Faulty connection at glow plug terminal
strip.
Clean and tighten ring terminal connector.
Probable Cause Remedy
Faulty 50A circuit breaker. Test 50A circuit breaker F1. (See “Thermal Circuit Breakers Test” on page 4-74.)
Tripped 30A circuit breaker. Reset 30A circuit breaker F2.
Park brake lever is in the released position. Place the park brake lever in the locked position.
PTO switch is in the ON position. Place the PTO switch in the OFF position.
Faulty park brake switch. Test park brake switch. (See “Micro Switches Test” on page 4-82.)
Faulty PTO Switch. Test PTO switch. (See “PTO Switch Test” on page 4-78.)
Faulty accessory relay. Test accessory relay. (See “Relays Test” on page 4-75.)
Faulty key switch. Test key switch. (See “Key Switch Test” on page 4-76.)
Faulty key switch circuit. Measure continuity between the key switch and starter solenoid. Continuity must be
indicated.
Probable Cause Remedy
Faulty fuel shutoff solenoid. Test fuel shutoff solenoid. (See “Fuel Shutoff Solenoid Test” on page 4-84.)
Faulty fuel pull-in relay. Test fuel pull-in relay. (See “Relays Test” on page 4-75.)
Faulty park brake switch. Test park brake switch. (See “Micro Switches Test” on page 4-82.)
Faulty key switch. Test key switch. (See “Key Switch Test” on page 4-76.)
Faulty key switch circuit. Measure continuity between the key switch and starter solenoid. Continuity must be
indicated.
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