Question about 1981 Suzuki Gs 550 L

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Alternator is pushing 20 volts

The alternator is puttin out 20 volts of juice instead of the 13-15.5 it should. is this causing the battery to drain and the turnsignals not to work when the battery gets worn down? thanks for any help

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1981 used selenium rectifiers which were fairly low amperage. Not likely that overvoltage is the problem, but rather a failed rectifier and not changing to DC voltage (half wave). Get a 50-amp silicon rectifier from Radio Shack and replace it. Better yet, if you now have a headlight law in your state, change to a 50-amp bridge rectifier and gain more charging from the same alternator... be sure to get some help with the conversion from simple rectifier in-line to the battery and a bridge rectifier connecting both battery terminals to both alternator and ground.

Posted on Oct 07, 2009

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