Alternator Control System Test

Charging System-Troubleshooting Alternator Control System Test (Part 1 Of 3):

NOTE: Before testing, check proper operation of the ELD by confirming with the MIL

CAUTION: Be sure to use a voltmeter with its plus terminal connected to battery plus and its minus terminal to the 4P connector terminal No. 1.

Charging System-Troubleshooting Alternator Control System Test (Part 2 Of 3):

Charging System-Troubleshooting Alternator Control System Test (Part 3 Of 3):

NOTE: Be sure the battery is sufficiently charged

CAUTION: The voltage will rise quickly when the alternator is full-fielded. Do not allow the voltage to exceed 18 V: it may damage the electrical system.

NOTE: Attach a probe to the VAT - 40 full field test lead, and insert the probe into the full field access hole at the back of the alternator. Switch the field selector to the "A (Ground)" position momentarily, and check the amperage reading.