Circuit/System Verification

Ignition OFF, measure and record the battery voltage at the C1 terminals. The voltage should be between 12.0 - 15.0 V.
- If not within the specified range, refer to Battery Inspection/Test .
Verify that a test lamp illuminates between the M64 starter motor B+ terminal A X2 and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
Test for less than 0.5 V between the positive battery cable and terminal A X2 at the M64 starter motor as ignition is switched to start position.
- If greater than the specified value, replace the positive battery cable.
Test for less than 0.5 V between the negative battery cable and the M64 starter motor case as ignition is switched to start position.
- If greater than the specified value, replace the negative battery cable.
Remove the drive belts. Refer to Drive Belt Replacement - Accessory
Ignition start, verify the engine does not crank normal.
- If the engine cranks normal, inspect the engine and belt drive system for mechanical binding, seized generator etc.
If all circuits test normal, replace the M64 starter motor.