@just-jeepin said in Please help: dual batteries:
@sovande There seem to be two problems: the dual-battery setups (and/or the sheer over-complexity of modern vehicles) lead to an inherent parasitic draw
Let me be clear about draws. They are not a result of modern cars. Some amount of draw has been normal longer than I've been alive. For decades, the standard has been 20-30mA is acceptable, even in the 70's and 80's. I test modern cars with 60+ control units and two batteries every now and then, and still find them below 15mA at rest.
As far as not telling you where the aux battery is, I suspect that's because they don't actually want you working on it unless you already know what you're doing.
Forums only serve to make you paranoid, unless you can find that one surly old tech who pops in with the right info occasionally, otherwise they're just eco chambers of people who don't understand anything made on the last twenty years, at best.
If aux batteries are indeed leaving people stranded, that is a Jeep thing, and may take them years to rectify, if ever. I suggest talking to a Jeep tech about all this. Sometimes aftermarket solutions are excellent, so your genesis kit might be you're best option.