The alternator usually use 6 diodes (for 3 phase). It's difficult to check diodes in-circuit. Mahirap gawin pero madali mo sanang natrobleshoot ang problem kung na-isolate mo ang mga ito.
Tips for alternator troubleshooting:1. low/intermittent charging - carbon brushes. 2. if bad ic reg. - overcharging depende sa ckt config. Kung ako may-ari niyan at ang problema ay ic, i'll replace the ic with an outboard module with discrete parts, two xtors, one or two zeners, several res and caps, probably two 1A silicon diodes. Syempre, may heatsink ang 2N3055.
This outboard voltage reg module will outlast the car because it can be repaired without opening the alternator.
Imo, the last item that could cause the problem is the 3 phase coil due to the # 12awg or better, winding. Possible problem, but not probable.




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