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Old 26-05-2024, 15:10   #1
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Join Date: Mar 2021
Location: Flagler County, FL, USA, Earth
Boat: Lagoon 380
Posts: 1,514
Wonky alternators

I have been having a fit debugging intermittent tachs on both VD MD2030 motors.
The W post on the alternators sure enough goes to zero ac volts when the tachs go weird.
Weird means here a zero reading or some short lived mid rpm reading. V belts are not loose. B+ still at 14.4vdc when tachs die.

The W signal is fed from one phase of the stator. Not much to go wrong. But it occurs to me that fully charged start batteries can shut down all field current ? Do others have tach/alternator issues similar to mine?
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