pianotuna wrote:
Hi Phil,
No. The back feed is happening before dawn. I think it is a simple voltage issue. The AGM's are higher voltage than the starter jar.
Can't be any feed back unless they are some how connected
Given your system layout wth relays from the batteries to the alternator
Your relays are failing, (is it relays or marinco switches)
Possibly pitted, current is flowing from house thru relay to common alternator terminal to engine battery
Your charge circuits are an add-on
Could also be the aux start relay (if that is a separate relay)