Old-Biscuit thanks, with this diagram I should be able to dig deeper. I have a couple old DVM’s around the garage or pole barn so I can back track things and hopefully figure out what is going on. I follow you with everything across pin 1 & 4 with 12 volt and fuse #19 as supply fuse. But I am lost on ”RAM ---pin S/B hot” can you explain, not sure what that mean?
I am curious about something. Are there any issue related (say popping a fuse) to plugging into Alternating Current shore power with respect to the trailer, while it’s still plugged in with the umbilical cord into the truck? Like back feeding the truck so to say with the inverter, or does that leg have a diode in it somewhere, or isn’t it even an issue? You probably know what I am thinking might have happened with the previous owner. I guess I will know more once I get out there and work on it a bit.
Thanks, everyone for the feedback.
Bob
