Thanks cletis, I'm still in wiring 101 despite having restored two old vehicles -- was able to figure out things by trial and error, taking them apart etc. -- did not do much wiring.
I know what accessories and circuits are but could you give me an example of connectiong to an accessory circuit and how do you connect wire to an old connector or rear light terminal I've tried splicing but I know that's not the correct way to do it.
Appreciate your help. Thanks!