Is this normal? I have two battery setup, starting and house. I have not checked the battery charge in some time, entirely possible I just need a replacement, but I'd like to check your thoughts on what I should be troubleshooting first.
I have two battery setup, starting and house.
Well then, begin at the beginning.Check the battery connections, both at the power source (battery) and the isolation switch. There appears to be some form of "mis-connection" .Let's try this. I'm assuming you have an isolation switch so what is your switching procedure for starting the engine and then supplying the house loads?
I am told the accessories and cranking battery were isolated.
If the back of your switch looks like this (Perko type):Battery 1 positive lead to top left postBattery 2 positive lead to top right postPositive battery cable lead from bottom center post to positive post on engine starter and......6 gauge fused lead from bottom center to helm buss (positive) to feed electronics/lights/pumps whatever.You do "isolate" one battery from another ( except when your in the both/all position) but both starting and your helm electronics will be powered at the same time from the same battery. A weak battery would cause the symptoms you describe. Placing it in the both/all mode just uses both batteries and again indicates one or both need charging.This is old school switching and to actually "isolate" starting from house you would need an additional switch.