Galvanic isolator messed up wiring - SailNet Community
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post #1 of 2 Old 12-17-2017 Thread Starter
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Galvanic isolator messed up wiring

I spent the morning trying to figure out why I'm getting through zincs rapidly (6 to 8 weeks).

There are two ground bus strips, separated by a 50A West Marine galvanic isolator. How the boat was wired is that all the grounds, the incoming a/c, the bonding system, the a/c outlets, water heater, everything, apart from the battery charger a/c ground, were connected to one bus, and then the battery charger was connected to the other.

So the only thing isolated by the galvanic isolator was the battery charger. I've put the wiring right : incoming a/c ground to one bus, all the others on the other. The meter reads 0.9V both ways on diode check mode, between incoming a/c ground, and the other grounds.

I just don't understand how it wound up that way. Ill-informed previous owners? It could have been like that from the factory, as the wiring looks original. Has it really been eating zincs for 33 years?

Bristol 31.1, San Francisco Bay

Last edited by MarkSF; 12-17-2017 at 09:37 PM.
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post #2 of 2 Old 12-18-2017
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Re: Galvanic isolator messed up wiring

Galvanic isolator is only a part of the equation. It only protects the metals from galvanic action that might be caused by other boats. If zincs are depleted so fast, it is better to check your battery connections and related wiring.
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