trailer battery charging wire?
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New User
Joined: Nov 2013
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trailer battery charging wire?
hello, im trying to get my slide in camper charging from truck system. i made a 7 wire cord to go between bumper and camper about 12' of 14 gage wire but there is a major voltage drop. so now i want to hard wire a in bed 7pin plug. im looking for the colors of the 12v trailer battery charging wire and also the color of the running lights wire that run on the frame on the drivers side. thanks
.. how are all your campers hooked up?
.. how are all your campers hooked up?
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
Lead Driver
Joined: Feb 2013
Posts: 5,006
Likes: 72
From: Roseville, MN
Here's my setup
I got a project box from Radio Shack and a fuse block, a rocker switch, and an auxiliary relay from an auto parts store. I attached the fuse block to the bottom of the project box and attached the box under the hood hinge on the driver's side (it seemed like the best place). I also drilled drain holes in the bottom corners of the box. There's a cover for the box but I took it off for the picture. The picture shows more relays for other accessories. If you're only doing the one you could use an inline fuse and you wouldn't need the project box.
I ran 10 ga wire from the battery to the fuse block, from the fuse block (through a 30 amp fuse) to the relay and from the relay to the connector I mounted in the bed. Smaller wire goes from the fuse block to the switch to the relay. I also used 10 ga wire for the ground from the plug to the truck frame.
This setup lets me turn the feed on and off, so I don't drain my truck battery when the camper is parked. You do need to be careful with any setup not to use it when the camper battery is drained too far, it'll blow the fuse. If it gets drained too far you'll need to charge it another way first.
I got a project box from Radio Shack and a fuse block, a rocker switch, and an auxiliary relay from an auto parts store. I attached the fuse block to the bottom of the project box and attached the box under the hood hinge on the driver's side (it seemed like the best place). I also drilled drain holes in the bottom corners of the box. There's a cover for the box but I took it off for the picture. The picture shows more relays for other accessories. If you're only doing the one you could use an inline fuse and you wouldn't need the project box.
I ran 10 ga wire from the battery to the fuse block, from the fuse block (through a 30 amp fuse) to the relay and from the relay to the connector I mounted in the bed. Smaller wire goes from the fuse block to the switch to the relay. I also used 10 ga wire for the ground from the plug to the truck frame.
This setup lets me turn the feed on and off, so I don't drain my truck battery when the camper is parked. You do need to be careful with any setup not to use it when the camper battery is drained too far, it'll blow the fuse. If it gets drained too far you'll need to charge it another way first.
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New User
Joined: Nov 2013
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Thanks
My truck already has the wiring to the bumper 7pin. I was hopping to splice to the 12v power as well as the running lights off the lines that go back on the drivers side behind the cab leavening my 7 pin for a trailer. All I need is the color of the 12v trailer charging wire and the color of the running light wire thanks a bunch
My truck already has the wiring to the bumper 7pin. I was hopping to splice to the 12v power as well as the running lights off the lines that go back on the drivers side behind the cab leavening my 7 pin for a trailer. All I need is the color of the 12v trailer charging wire and the color of the running light wire thanks a bunch
Lead Driver
Joined: Feb 2013
Posts: 5,006
Likes: 72
From: Roseville, MN
I don't think there is a key-controlled 12V wire anywhere in the truck that is fused high enough to supply power to a trailer or camper. That's why I went with my own fused source and a switch/relay. I could have taken any low-amp accessory power feed to control my relay if I wanted it key controlled. I just chose to add a separate switch
5th Wheeling
Joined: Jul 2018
Posts: 44
Likes: 4
I have a 2018 F-350 XLT, with oem brake controller, I have watch that video and my truck does not do that. I haven't been able to get juice from that pin no matter what I do.
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Lead Driver
Joined: Jun 2021
Posts: 5,221
Likes: 805
a 2018 f350 should have a standardized 7 blade pllug in receptacle. I am unsure if it it means youu get one in the bed, but I am sure your bumper has one one or you have a spot for it. can be bought at walmart
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