We finished up the solar install today. First we took out a little protector panel in the front storage bin that was protecting the wires coming in from battery. Then we installed a block of 1x6 to the back of it so it would have adequate support for the marine shutoff. Then we pulled the original positive from the battery into the marine shutoff and ran a new wire from shutoff to battery insulating with plastic protector where needed. On that same post we also connected the incoming line from solar panel so I can shut off the draws from trailer when storing but still have solar charging batteries. Then we fastened shutoff to block. (Note of caution: always tow trailer with switch in on position bc in an emergency, if you lose your trailer due to a decouple, the electric brakes won't be able to engage because there won't be any power if you've lost connection from TV and are in shutoff mode.). Next we installed the two battery boxes to my new two place battery box using 1/4 in bolts 1 inch long with fender washers inside box and locking washers underneath. We connected the positive lead from shutoff to positive lead on one of the batteries. Next we connected two jumpers (positive to positive, negative to negative) to hook the batteries in parallel for 12 volts. ( We got the cables and boxes from the local Wal-Mart). The last step was to connect the positive lead from solar panel to the charge controller to complete the circuit. The solar panel was sending about 17 volts of power to the controller which was knocking that down to 14.4 to the battery for charging. I didn't have the new 2nd battery with me so we used the old one to finish but I am installing another new battery to go with the other new one tomorrow since I didn't want a new battery hooked to an old one. Hope that helps some folks out. It isn't a short job, but we weren't hurrying, either. I trimmed up any excess plastic insulator and cleaned up. It's all working beautifully, and we are off to take a trip in three days
2006 Flagstaff M-23lb with triple bunk.
2004 Dodge Durango SLT 2wd; Yeah, it's got a Hemi.
100 watt solar kit with Trojan AGM Series 31 pending