@harper7 out of curiosity, do you feel that connecting the batteries after two minutes of starting vs. connecting them right after the starter stops cranking would make a significant difference in terms of stressing the charging system?

I've yet to really plan out my dual battery wiring, but I was toying around with the idea of going with the standard IBS 200A relay (non-microprocessor controlled) and then just wiring that relay to activate off the IG2 signal (which momentary goes cold during cranking, as mentioned by KodeRush). Then tailoring the wiring a bit so I can add in a manual link switch of some sort.

I really like the IBS stuff since it's pretty much all you'd ever need and fitted in to a nice and neat package, but I jsut can't stomach the price