CarPC- wiring diagram help please

[Saskatoon Subaru]

ok, i'm redoing my CarPc setup and this time i dont wanna do a hack job as i did the first time, so here's a wiring diagram i made up for my self, could everyone who's installed a CarPc or has good knowledge let me know if it will work this way or what i should do to improve it, that would be a big help, and is anyone else using a start up/ shutdown controller, if so which one and how's well does it work?




now i wanna run two batteries, will that be to much drain on the alternator?


thanks in advance

[Legacy777]

I think you meant to post this in electrical