Section 4

CHARGING SYSTEM - OUTLINE OF DIAGNOSTICS, PARTS ORDERING AND WARRANTY APPLICATION

Section 4 - CHARGING SYSTEM DIAGNOSTIC PROCEDURES





1. Start the engine and confirm that the alternator warning light is not illuminating.

NOTE:
If the warning light is illuminated, the self diagnosis operation is functioning. Check the alternator and related harness' according to section "G" of the workshop manual.

2. Fluctuate the engine RPM and listen for alternator bearing or engine belt noise. If noise is present, inspect for loose or damaged belt or damage to the alternator bearing.

NOTE:
Perform the above inspection with the vehicle headlights illuminated.

3. Turn off the ignition and all accessories. Connect a load tester (VAT-40 or equivalent).








4. Apply the load test referring to the chart shown. The final voltage must be above the standard minimum value as shown.

If the voltage measures at or above the minimum, proceed to step 4.

If the voltage is below the minimum, quick charge the battery for 30 minutes and load test. If the battery remains below the minimum, replace the battery and proceed to step 4.

NOTE:
Battery inspection and charging procedures for Navajo vehicles are different than those outlined in this bulletin. Refer to the workshop manual for instructions.

4. Start the vehicle and raise the RPM to 2500.

5. Connect a battery load tester (VAT 40/70 or equivalent).

6. Apply a load equal to the alternator rating. The generated voltage should be 14.1V to 14.7V

LOAD TEST RESULTS

Over 14.7V - Replace Alternator

Under 14.1V - Check for resistance between the battery and terminals "B" and "S". If resistance is present, repair the damaged harness and retest. If the voltage is still below 14.1V, replace the alternator.

14.1 V to 14.7V - No trouble with the alternator or battery.





ALTERNATOR AND BATTERY CHECK SHEET