Thanks for the help and the diagrams. The truck is a 1/2 ton chevy. I'm thinking about running the charge wire directly from the alternator to the battery isolator and then directly to the camper battery. And I probably will install a fuse block in line just back of the alternator. I'm thinking I only need to run a red wire (+) back and then from the battery a ground to the frame. This way it can save on some wire cost. Or do I need to connect it to the battery post. And how the alternator differentiate between the truck battery and the camper. Basically you want the truck to charge first and then move onto the camper battery??
I want to get my son a charging kit for his camper so when he drives it charges his battery from the truck. I'm thinking I need to run a 4 or 6 gauge from the truck battery back to the camper then figure out some kind of plug arrangement from the camper to the truck wire charging line. I know I need a fuse at the battery and a regulator to keep the truck battery from discharging while pluged in. I know someone out there has done this before. Is there a kit???