Solar question

I didn't use the plugs, I used the configuration of the wires or the polarity of the wires as marked going + to plus and - to - . The problem I had was on movement of the battery case the wires shorted catching on fire and blowing the neg pole out of the right battery. Replaced the wire that looked like it was the one that shorted with a piece of PVC pipe to protect it, and both batteries since I want them to be the same age (6 volt), and everything was fine for a couple of trips. Then on another trip, hooking up to leave the lake, pulled on the plug to hook to the truck, blew up again and blew the neg post out of the right battery again. The fire extinguishers are getting expensive, let alone the batteries. I have it going in to the shop this week. Hope to get it figured out, I have a reservation at the coast starting Friday. Thanks for the reply's.

Mike