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Hi All,
A couple of answers have come close, but so far no one has nailed it so I will leave it open for a few more days before revealing the answer.
Since no one got it quite right, here’s the answer.
I have also closed the comments to this tip. If you have thoughts, please comment on the answer tip.
looking for vampire power draw? The meter has an amp clamp around the pos or neg and looking for current draw from unsuspecting devices?
Stray currents? Meter between battery negative and main anode?
I am assuming the meter is in Volt measurement mode. Otherwise, knowing the author, he would have specify an Amp meter of an Ohm meter.
Must be looking at the battery posts (plus and minus) for voltage rise when disconnecting versus voltage drop when reconnecting to identify the load that does not have a breaker.
From the less than stellar history of that electrical system, probably just hunting for the end of a wire…
Looking for parasitic current draw with a volt meter, the meter would have to connected across the shunt resistor.
you are looking for a very small stray current maybe?
Looking for reactive loads?
Stray current in rig/bonding system. You are reading voltage from pos bus to various points on ground bus and then disconnecting loads to find stray current culprit?