Originally Posted by GenXair
I just finished reading your amazing journey in reducing the tongue weight and have a few questions.
Did you remove the original battery cables or used them to connect the new wires? Do you have a photo of this?
Why did you downgrade the 12v
batteries to 6v?
12V are also lighter 56lbs
GenXair, the cables from the factory battery box run up through the floor into the front storage locker (on an FB, I assume this is similar for other varients) and terminate on a positive and negative bus bar in this area. The wires to the batteries could be left connected and in place so long as you disconnect the positive from the bus bar so it is not live. I opted to remove them. You will need to extend the positive supply wire from the tongue jack back to the positive bus bar in the front storage locker since this is normally connected directly to the battery. Removing the batteries frees up the battery box for other uses....I now store my Anderson levelers, some pads for the stabilizer jacks, a wrench for my ProPride and can of spray lubricant in there.
On reuse of the battery cables - When you have relocated the batteries you will need to run suitably sized positive and negative cables from the batteries back to the same bus bars to power the coach. Since you will want to use larger wire gauge for this and since the cable runs will be much longer you will want to use new cables. I used 2ga, the original cables were 4ga I believe. Make sure you add a breaker on the positive wire close to the battery to protect the cables in the event of a short.
On the reason for 6V v 12V batteries - Connecting 2 x 6V batteries in series
gives you a 12V battery with the same AHr as a single 6V battery (2 x 200 AHr 6V batteries in series = a 12V 200AHr battery). In contrast, 2 x 12V batteries connected in parallel
gives you a 12V battery with the sum of the AHrs (2 x 100 AHr 12V batteries in parallel = a 12V 200 AHr battery). The batteries appear to be equivalent but the 6V units will have slightly thicker plates and will in general be more able to handle abuse / heavy discharges than the 12V solution. A battery made of 2 x 6V units is therefore seen as an upgrade although differences are likely not noticeable to the average camper.
Attached is a photo in the front storage locker. The white circle is the negative bus bar, red is the positive bus bar and purple (hard to see) is where the cables come up through the floor from the battery box. The silver box you can see mounted on the side wall is the factory 1000W inverter, the black box is the 7 pin junction box (cable to hookup to your TV terminates here). You can also see the "store/use" solenoid which isolates most of the coach 12V users when in store mode.