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Tool Talk Discussion Forum

Re: can a 4 prong trailer harness run electric brakes?

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John T

04-26-2013 18:12:25

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The more normal typical connection for 4 poles is:

1) Green Right Turn & Stop
2) Yellow Left Turn & Stop
3) Brown Tail/Marker
4) Ground

If the wants to use the hitch ball itslef to make up the ground to ground connection I DO NOTTTTTTT RECOMMEND THAT METHOD I guess he could use the No 4 for brake circuit BADDDDDDDDDD

The more normal typical connection for the 6 pole called Horse Trailer plug is:

1) Right Turn & Stop
2) Left Turn & Stop
3) Tail/Marker
4) Ground
5) Auxiliary 12 VDC Power (like for a bunk light etc or to charge a trailer battery)

The 7 Pole RV plug has yet one more pole for back up lights

Now which method is he gonna use??????

John T

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04-26-2013 18:28:15

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 Re: can a 4 prong trailer harness run electric brakes? in reply to John T, 04-26-2013 18:12:25  
It's just weird how it's 4 prong and has electric brakes and he said they've (brakes) worked before. But as "old" said it can be done, although it's not recommended. It's already wired like that and I was just trying to help him get the brakes working. Thanks for all the input.

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John T

04-26-2013 19:20:14

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 Re: can a 4 prong trailer harness run electric brakes? in reply to willys53allis, 04-26-2013 18:28:15  
Youre welcome, yep as I noted if he has stop and turn and tail lights that takes up 3 of the 4 poles so the 4th normal ground pole he must be using for brakes and relies on the hitch ball to make frame ground connection with the trailer. Again that can work but like I said I do not recommend it lol

John T

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