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ALTERNATORS AND STARTERS
TROUBLESHOOTING GUIDE
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PROBLEM
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CHECK THESE PROBABLE CAUSES
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ALTERNATORS
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| NOISY ALTERNATOR |
1. Worn or prayed belt. 2. Loose
alternator mounting. 3. Alternator fan hitting
house. 4. Loose pulley and fan assembly.
5. Too tight a fan belt causing bearing failure. |
| OVER CHARGING (BOILING BATTERY) |
1. Battery.2. Bad connection in
wire harness to the alternator.3. Bad regulator.4.
Bad connections, main power lead at the battery
fusible link.5. Corroded battery terminals. |
| LOW OUTPUT FROM ALTERNATOR |
1. Loose fan belt on alternator.2.
Loose fan belt from crank shaft pulley to drive
pulley for the alternator.3. Bad or misadjusted
regulator.4. Bad battery (not accepting the
charge from the alternator).5. Bad connections
in wire harness. 6. High resistance across
the fusible link. 7. Corroded battery terminals. |
| NO OUTPUT FROM THE ALTERNATOR |
1. Bad connection in the wire harness to
alternator. 2. Bad ignition switch. 3.
Loose or broken fan belt. 4. Bad regulator.
5. Bad battery (not allowing the regulator
to turn on). 6. Bad ground connections. 7.
Regulator sensing circuit open. 8. Bad control
relays. 9. Bad ground circuit to the regulator.
10. corroded battery terminals. |
| MORE QUESTIONS
? ... |
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STARTERS
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| STARTER FAILS TO OPERATE (AT ALL) |
1. Dead battery .2. Bad battery
cable connections. 3. Ignition switch faulty
.4. Open wiring in the starter circuit. 5.
Bad starter relay. 6. Bad solenoid. 7.
Loose connection on solenoid. 8. Bad battery. |
| STARTER RUNS BUT ENGINE WILL NOT WORK |
1. Worn teeth on the ring gear. 2. Broken
section on the ring gear. 3. Faulty solenoid.
4. Improper adjustment between starter drive
and bell housing(shims). |
| STARTER CRANKS BUT ENGINE SLOWLY |
1. Weak or dead battery. 2. Engine
overheated. 3. Engine oil too heavy. 4.
(diesel) weeping injectors. 5. (diesel) bad
or closed pump. 6. Too tight an engine (just
rebuilt or overhauled). |
| STARTER DRIVE WILL NOT DISENGAGE |
1. Starter loose on mounting. 2.
Faulty ring gear. 3. Faulty ignition switch.
4. Faulty start relay. 5. Faulty solenoid.
6. Poor spacing between starter and ring
gear (spacers). |
| WHINE SOUND DURING CRANKING |
1. Bad ring gear. 2. Poor spacing
between drive and ring gear (too much). |
| WHINE SOUND AFTER KEY IS RELEASED |
1. Bad ring gear. 2. Poor spacing
between drive and ring gear (too little). 3.
Drive will not disengage. |
| More Questions
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