TV battery and battery bank powering inside lights question?

[BCsteve]

It is obviously a smaller 14g wire so too small to use to recharge the trailer battery.

Steve:

Is that 14 gauge wire on the truck side or the trailer side?



T

After closer inspection, the black wire from the trailer connection is larger than 14g, likely 10g which seems to be the standard. The trailer manufacturer spliced in a 14g wire to the inside of the trailer since they were only using it for the interior lights. I think I’ll disconnect the 14g wire and replace it with a 10g and use it to maintain/charge the trailer battery when driving and just connect the interior lights to the trailer battery. That should keep things simpler. Thanks for the input everyone.

[rjgimp]

If the singular goal is to have the lights work when unhitched, you could wire a vehicle-side connector directly to the trailer battery so that when you disconnect you would unplug the trailer-side cable from the truck and then immediately plug it into the one mounted on the trailer.