A camping forum for VW bus and camper owners.
I would check on the Samba I bet you will find a lot of info. I do not have any way of knowing your wireing layout to give you any helpfull information.
Bill Witz 84 westy (happy with Go Westy aux. battery setup).
Hey, another Oaklander!
I'd agree that the samba would be the place to check this, or just trace the wiring. In my bus, I've hooked the two batteries together in parallel after my isolator died and it's been fine for the past 3yrs. Although not ideal (because if one battery dies it'll drain the other) it does work. Prior to me doing that, the second battery just powered the fridge and rear 12V socket. I think it would be mighty tedious to rewire the bus so that the lights and radio are on the second battery only.