Join Date: Feb 2010
Location: Narragansett Bay
Thanked 379 Times in 358 Posts
Rep Power: 9
I think the safest way to go about this is to physically trace the wire coming off the switch to whatever it is connected to. One side will likely go to a power bus, which won't tell you anything. The other should go to the device it is switching.
Checking for voltage or continuity can be a little complex, if you're unfamiliar.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.