Question about 1981 Suzuki GSX 400 F

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Alternator don't charge the battery, change carbon?

Hi, my alternator don't charge the battery, my guess its time to change carbon, how do I do this?

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It will be a permanent magnet alternator, there are no carbon brushes, you will need a manual for that model and start checking resistances with a multi meter.
without being able to tell you exact readings...
there will be three wires the same color coming from the stator(usually all yellow or all white) the resistance between any pair must be the same, and none of them should indicate to ground. When the bike is running any pair of these will produce about 50volts AC.
If this checks out you probably need a new regulator

Posted on Apr 29, 2010

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I would suggest getting a new stator instead of rewiring the copper. New stators(alternators) run about $90-$100, Rectifiers(regulators) also go for about the same. But the newer parts are designed to withstand more heat and stress than the stock parts. I have a 1981 GS450 and my stator gave out during a 500 mile trip. Old stator/rectifiers were set up on a 2 phase system, power the bike and charge the battery. But what about after the battery is fully charged, what happens to the excess energy. Well it turns your stator into molten coils and the diodes in the rectifier into regular wires. The new parts incorporate the 3rd phase that recycle the energy and have a larger heatsink in the rectifier. Basically i would go with the newer parts, or you risk a repeat of the molten coils.

Posted on Jul 28, 2011

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