Dual battery setup question

[alvald83]

I am running a dual battery setup in my '69 f250. I have an isolator between the starting battery and 92ah (group 27m) AGM camper battery. My question is, How do i keep it from overcharging while being charged by the alternator? Im using this AGM battery to power my camper LED lights and an inverter.
Thanks Al

[cash667]

Hi Al,
Since I‘m planing to build my own slide in camper I had some thoughts on the dual battery setup.
What about mounting a second alternator on the engine?
With this done, you will have two completely independent power circuits not affecting each other. You can use a one wire alternator with integrated regulator which will solve your overcharging problem. An external regulator will of course also work.

I‘ve no plan ready for mounting a second alternator but I can imagine that it could be somewhere, where the AC compressor would be if you haven‘t AC like me.

A alternator with a clutch in the pulley like the AC compressor has would be very awesome. In idea if something like this is available anywhere...

Cheers
Chris