Diagnostic Aids

Some conditions than may cause a too long pre-charge are:

• Pre-charge contactor that is inoperative and does not close
• Excessive resistance in the closed contacts of the pre-charge contactor
• Excessive resistance in the pre-charge resistor
• An open or excessive resistance in any of the high voltage (orange) circuits or terminal supplying voltage to the pre-charge resistor and contactor

Some conditions than may cause a too short pre-charge are:

• Primary contactor or pre-charge contractor stuck in the closed position
• Primary contactor control circuit shorted to ground, causing the primary contactor to remain closed even when not commanded closed by the Starter/Generator Control Module
• Too little resistance in the pre-charge resistor