Constant drain of 1 of 2 batteries

[nola mike]

So no connection between the batteries? What's a parallel switch? And stbd is the draining battery? Seems like an odd setup.

 

[dingbat]

One of the batteries for stbd engine and everything else, the other battery seems to be for port engine only. and I have a parallel switch on dash.

A battery switch on the helm is weird.
Never heard of or seen of such a thing on a Grady.

I have a light at the helm that lets me know when the ACR is active.
Have a OFF/ON/Combine switch on the transom

What year and Model?
All the Grady wiring diagrams are on-line

 

[nola mike]

A battery switch on the helm is weird.
Never heard of or seen of such a thing on a Grady.

Can't be a regular battery switch, it would take too much high current wiring