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Standard wiring diagram for trailer

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screaminghollow

04-25-2003 18:55:40




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I've got four trailers I use on my farm. I want to convert all of them to the large 7 prong RV plug. My problem is that I have two different diagrams for the plug wiring. Both from commercial companies and both are different. Anybody able to direct me to a standard diagram on a web site?




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stephen

07-24-2003 17:54:03




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 Re: standard wiring diagram for trailer in reply to screaminghollow, 04-25-2003 18:55:40  
Try the following link for the correct way to wire them up, and good luck!

http://www.marksrv.com/wiring.htm



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Tim

04-29-2003 16:25:30




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 Re: standard wiring diagram for trailer in reply to screaminghollow, 04-25-2003 18:55:40  
Use a 12v test light to figure out the pattern on your truck then wire the new plugs on your trailers to match.



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edk

04-27-2003 08:46:44




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 Re: standard wiring diagram for trailer in reply to screaminghollow, 04-25-2003 18:55:40  
Also had brake troubles when purchased a new horse trailer with R-V conversion. Brakes would not work at all.

Found that truck dealer here had spliced the blue brake wire into both the side pin and the center Aux pin on the male connector at truck. Would work on trailers that had no aux connection but shorted on anything where both center and side pins had a connection.



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chief 83

04-26-2003 09:42:28




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 Re: standard wiring diagram for trailer in reply to screaminghollow, 04-25-2003 18:55:40  
I've been through this same thing several times. I think that for some reason horse/stock trailers are wired differently than any other. My experience has been that the only real difference is the brake and aux. wire are opposite. On most trailers the center "pin" is used for the aux. and one of the outside "pins" is used for brakes. It seems on horse trailers the center is used for brakes. I just made an adapter. It was easier than wiring 2 different set-ups on the truck.

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Ludwig

04-26-2003 11:07:46




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 Re: Re: standard wiring diagram for trailer in reply to chief 83, 04-26-2003 09:42:28  
Yup, some utility trailers in horse country will tend to be wired the same as stock trailers. I ran into this very situation when borrowing a friend's utility trailer. We were baffled for awhile why my truck "magically" locked the brakes while his didn't. He accused me of having a bad ground, etc. Finally I started messing with the hot wires and discovred the problem. His is the only trailer I pull what has brakes so for now its not a problem.

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Ludwig

04-26-2003 11:04:17




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 Re: Re: standard wiring diagram for trailer in reply to chief 83, 04-26-2003 09:42:28  
Yup, some utility trailers in horse country will tend to be wired the same as stock trailers. I ran into this very situation when borrowing a friend's utility trailer. We were baffled for awhile why my truck "magically" locked the brakes while his didn't. He accused me of having a bad ground, etc. Finally I started messing with the hot wires and discovred the problem. His is the only trailer I pull what has brakes so for now its not a problem.

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REBO

04-26-2003 05:26:24




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 Re: standard wiring diagram for trailer in reply to screaminghollow, 04-25-2003 18:55:40  
check this site; www.tekonsha.com there is a lot trailer brake info, go to "bargman" for trailer wiring



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Joe (Wa)

04-25-2003 23:00:47




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 Re: standard wiring diagram for trailer in reply to screaminghollow, 04-25-2003 18:55:40  
Here is one to get you started on your research. Joe



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RAW in IA

04-27-2003 19:04:36




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 Re: Re: standard wiring diagram for trailer in reply to Joe (Wa), 04-25-2003 23:00:47  
I looked at that site, and they use a different color arrangement than semi-tailers do. If I remember right, brown = clearance/tail lights, black= also clearance/brake lights ( some had split systems), red= stop, yellow= left turn, green=right turn, blue=uaxiliary use, white= ground.



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Ernie Bob

04-25-2003 22:29:55




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 Re: standard wiring diagram for trailer in reply to screaminghollow, 04-25-2003 18:55:40  
I'm not sure but I think it might have something to do with the wiring of the electric brakes. I tried to borrow my uncles 4 horse trailer and the brakes were locked tight, unplug it and they were free. I talked with my nephew whose flatbed I use regularly and he said that there are two adapters to use because the hot wire for the brakes is hooked up two different ways. The adapter for his is probably opposite from the one that my uncle uses. I sure would like to hear more about this cause I'm a little confused also.

thanks!
Ernie Bob

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Ernie Bob

04-25-2003 22:29:11




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 Re: standard wiring diagram for trailer in reply to screaminghollow, 04-25-2003 18:55:40  
I'm not sure but I think it might have something to do with the wiring of the electric brakes. I tried to borrow my uncles 4 horse trailer and the brakes were locked tight, unplug it and they were free. I talked with my nephew whose flatbed I use regularly and he said that there are two adapters to use because the hot wire for the brakes is hooked up two different ways. The adapter for his is probably opposite from the one that my uncle uses. I sure would like to hear more about this cause I'm a little confused also.

thanks!
Ernie Bob

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