Originally Posted by Bmaciver13
Ok so upon closer inspection the red one is the positive coming from trailer and the black one is positive coming from tongue hitch and white is negative. Does it matter who one the tongue hitch would be hooked up to in a parallel setup?
Currently you batteries are not connected in parallel. Basically the ways it's wired now, one battery is supporting just the tongue jack and the other is supporting the trailer 12v needs. The first thing you need to do is connect the batteries + to + and - to - . Once you do that it will double the amount of Amp hours available for both the tongue jack and trailer.
Secondly I would clean up the wire colors so everything is consistent on that a frame. If it was me all the (+) connections would be black and all the (-) connections would be white.
Last, there are different opinions on this, but personally I make both the (-) and (+) trailer connections on the same battery. One the batteries are connected in parallel, in reality they are one "battery pack" so it shouldn't matter if you make the connections on one or split it between both.