I should say the panel/regulator is a designed for purpose thing! Reading that first post makes it seem like we are Jerry rigging something! It’s a Ring 600 solar battery maintainer.

I know there is an OBD2 adaptor for this unit as well so that’s also an option but I’m being cheap and trying to use what he’s got!

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E53 3.0d Sport 119,000 Miles
E61 535d Estate - Hybrid turbos and Dark-side intercooler...389hp,792nm