
Table 7
Troubleshooting Test Steps
Values
Results
1. Condition of the Alternator Drive Belts
A. Inspect the condition of the alternator drive belts.
B. Check the belt tension. If the engine is equipped with an au-
tomatic belt tensioner, check the automatic belt tensioner.
Excessive belt tension can result in damage to the alternator.
Drive belt
Result:
The alternator drive belts are in good condition and
the belt tension is correct.
Proceed to Test Step 2.
Result:
The alternator drive belts are not in good condition
or the belt tension is incorrect.
If the alternator drive belts are worn or damaged, replace
the belts. Refer to Disassembly and Assembly for the cor-
rect procedure.
If necessary, replace the automatic belt tensioner. Refer to
Disassembly and Assembly for the correct procedure.
2. Condition of the Alternator Drive Pulley
A. Check the condition of the alternator drive pulley. Look for
deep grooves that have been worn into the pulley by the belt.
Check that the nut for the pulley has not become loose.
Alternator Drive
Pulley
Result:
There is excessive wear on the alternator drive
pulley.
Replace the pulley.
Result:
The alternator drive pulley nut was loose.
Tighten the nut.
Result:
There is not excessive wear on the alternator drive
pulley.
Proceed to Test Step 3.
3. Wear of the Alternator Bearings
A. Check the alternator bearings for signs of wear.
Alternator bearings
Result:
The alternator bearings are OK.
Proceed to Test Step 4.
Result:
The alternator bearings are not OK.
Repair the alternator or replace the alternator, as needed.
Refer to Disassembly and Assembly for the correct
procedure.
4. Operation of the Alternator or Regulator
A. Verify that the alternator or the regulator is operating cor-
rectly. Refer to Systems Operation, Testing and Adjusting, “Al-
ternator - Test” for the proper testing procedures.
Regulator and
alternator
Result:
The regulator and alternator are operating properly.
Proceed to Test Step 5.
Result:
The regulator and alternator are not operating
properly.
Repair the alternator and regulator or replace the alternator
and regulator, as needed. Refer to Disassembly and As-
sembly for the correct procedure.
5. Inspection of the Charging Circuit
A. Inspect the battery cables, wiring, and connections in the
charging circuit.
Charging circuit
Result:
The charging circuit is not working properly.
Clean all connections and tighten all connections. Replace
any faulty parts.
UENR0612
35
This document has been printed from SPI2. NOT FOR RESALE