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Tool Talk Discussion Forum

OT - Horse Trailer Wiring

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Rusty Scupper

08-19-2005 12:11:29




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I am stumped and need a little assistance from all of you guru"s..

Truck A (Chevy 2001) - has brakes box and 7 pin connector

Trailer A (Sundowner) - Has a 6 pin connector

Truck B (Chevy 1991) - has a brakes box and 6 pin connector

Trailer B (Sundowner) has a pin connector.

Both trailers appear to be wired the same. Only difference is that trailer A is not using the red wire.

If the respective trucks use their own trailers they work fine. When you swap trailer B with Truck A the trailer brakes lock up.

I have put a voltage meter on Truck A center pin (should be brakes, blue wire) there is no voltage, when I step on the brakes I get 12 volts, remove my foot from the brakes, still get 12 volts.

I am confused. Thanks

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TomWNC

08-21-2005 22:25:24




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 Re: OT - Horse Trailer Wiring in reply to Rusty Scupper, 08-19-2005 12:11:29  
Trailer B has how many pins?
Are you using an adapter between trailer and truck?
I have a truck with an RV style 7 pin connector and have used an adapter to a 6 pin trailer. The instructions that came with the adapter said that on some trailers you have to switch two of the pins in the adapter.



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Rusty Scupper

08-22-2005 09:22:17




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 Re: OT - Horse Trailer Wiring in reply to TomWNC, 08-21-2005 22:25:24  
Trailer B has 6 pins (sorry can"t type)
Truck A/Trailer A I use an adapter

I tried switching two of the wires but that locked up the brakes without the foot on it.

What is odd, is that what is the Brake wire from Truck A. There is no voltage with foot off the brake (normal) then when you put your foot on the brake you get 12V (normal), then remove foot and still get 12V.

In either case if Truck A works with Trailer A, I should be able to rewire Truck B/Trailer B to work accordingly. One would think.

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TomWNC

08-22-2005 19:10:16




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 Re: OT - Horse Trailer Wiring in reply to Rusty Scupper, 08-22-2005 09:22:17  
This link shows a diagram for the 6 pin wiring. Problem is not all trailers use this exact layout. If you have an ohm meter find which pin on trailer is ground (o ohms to frame). Take a set of jumper cables from truck battery and clip ground to frame of trailer. Put a nail in the hot lead and insert into the other (not ground) holes and note which lights/brakes work, brakes will usually hum when energized. Use a 12V test light to test output from adapter plugged into truck and see if pins match up with trailer. As for your problem with power staying on after foot is removed from brakes, sounds like a problem in controller.

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Case450

08-21-2005 18:39:48




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 Re: OT - Horse Trailer Wiring in reply to Rusty Scupper, 08-19-2005 12:11:29  
I have a 2003 GMC Sierra 3500 One ton dually I use for pulling my cargo trailer and my ten ton float. My cargo trailer I installed a flat four pin wiring harness because it was the most basic one i could find. I than patched my clearance and side lights into the corresponding wire. Now, the truck itself has a female seven pin harness. I just use a seven pin plug in adaptor that allows the four pin cargo harness to plug into teh back of that. My float uses a seven pin harness and both work fine. the float just plugs straight in and the cargo trailer plugs into the adaptor and the adaptor in the truck. I dont think this of any use to you but just sharing with ya how my get up works.

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Richard H.

08-20-2005 06:37:37




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 Re: OT - Horse Trailer Wiring in reply to Rusty Scupper, 08-19-2005 12:11:29  
Hi Rusty, this site is what I used to wire the trailor I built. Hope it helps. Richard Trailer wiring



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