SEV MOTOROLA Alternators: Overhaul: Testing: Diodes

Check diodes with a diode tester. If any of the rectified diodes are shorted or open, the diode holder must be replaced. If any isolation diode is faulty, replace holder, complete with isolation diodes. If diode tester is not available, diodes should be unsoldered and tested with an ohmmeter. Diodes should show high resistance in reverse direction and low resistance in flow direction.