Do not check the generator's performance for a "spark," even by briefly connecting the positive terminal of the generator to ground. This will cause significant current to flow through the rectifier unit, damaging the diodes. The generator voltage can only be checked with a voltmeter.
the negative terminal of the battery must always be connected to the vehicle ground, and the positive terminal must be connected to the generator terminal. The opposite (incorrect) connecting the battery will dramatically increase the current flowing through the generator diodes, causing them to fail.
Do not test diodes with voltage greater than 12V or with a megger, as it has too high a voltage for diodes. In this case, the diodes will be broken during testing (a short circuit will occur). When checking the insulation of electrical wiring with a megohmmeter, disconnect all wires from the generator.
Disconnect all wires from the generator and battery when electric welding body parts.
Check electrical circuits and components and troubleshoot problems with the engine off and the battery disconnected.
Before removing the generator, disconnect the ground wire from the battery.
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After installing the generator, connect the ground wire to the battery.