On Thu, 17 May 2007 12:16:04 GMT, nick
wrote:

Is it possible that instruments (depth sounder, autopilot head, etc)
could be leaking to the hull?

Sorry for the long winded post but hoping to get to the bottom of this
without paying a sparkie a fortune to do it for me...

The leakage could be almost anywhere.

Probably the fastest way to find it is to start by disconnecting or
turning off all of the DC circuits. Hopefully that makes your leakage
voltage disappear. If not, start at the batteries and breaker panel.

Next step is to start turning things on one at a time until the
voltage reappears. That will indicate the offending circuit or
component.