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Electrical System Check

Engine Wiring Harness

Multi-plug loose. Broken wire. Corroded pins in multi-plug. Water ingress into plug (+lead/pin will fizz away in short period of time).

Alternator

Defective rectifier (within the unit). Field windings/brushes worn out. Loss of field magnetism. Loose wiring on back of alternator. Loose or broken drive belts.

Starter Motor

Water ingress. Failed solenoid. Loose battery cables. Field windings burnt out. Bendix stuck.

Main Earth Lead

Corroded terminal. Come loose giving poor connection.

Battery

Flat. Low on distillate. Shorted plates. Reached the end of its life. Corroded or broken terminals.

Battery Isolator Switch

Corroded or loose terminals. Defective switch. Internal contacts burnt or worn out.