For some reason the the trailer batteries are not getting charged. The 7-way plug on the truck shows the proper voltage as tested with a lighted probe by U-Haul (I took the truck there to check). The supposed current wiring is setup to charge the trailer batteries (3 batteries) when the running lights are on on the truck.
The trailer has Equalizer powered leg retraction/deployment system with an up/down switch. I used a spare battery to make sure the switch was not the problem.
When I connect the trailer plug into the truck's 7-way receptacle (there are two and neither is sending 12v to the batteries), I can't get the switch to work. The truck's two batteries should be able to activate the switch. This leads me to believe that the trailer plug is not wired right. Not having a schematic etc. I don't want to guess which is which.
I have decided to direct wire from the truck's battery to the rear bumper area and then have a separate wire from the batteries on the trailer to plug into the one from the truck.
The truck is over 20'. Questions:
1) Will an 8 gauge wire be enough from truck to rear bumper area?
2) Will 10 gauge wire be ok from trailer to rear bumper area or should I use 8 gauge?
3) What size fuse should I use?
4) You see any potential problems with this?
I just had a thought. If the batteries are supposed to get a charge from the truck when the running lights are on, wouldn't the running light wire and the battery charging wire be on a common terminal in the trailer plug? If so, I did not see that when I took the plug apart. Unless they used a separate terminal on the receptacle with a wire to the battery and a separate one in the trailer plug for the batteries. Somehow if the latter is true, then the connection is not being made.
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