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Old 02-14-2010, 06:09 PM
LawnSite Senior Member
Join Date: May 2007
Posts: 547
Trailer brake wire

I am installing new wire to my trailer. My trailer brakes (one axle both sides) have a red and black wire. Does the black go to the trailer plug or ground on trailer? Previous wires were all melted together and had no color coating left.
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Old 02-14-2010, 08:54 PM
whitebp1 whitebp1 is offline
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Join Date: Apr 2009
Location: Collierville,TN
Posts: 76
red will be for the brakes power black should be ground..

well after doing a search myself i could be wrong check out this :
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Old 02-14-2010, 10:39 PM
overtime mp's Avatar
overtime mp overtime mp is offline
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Join Date: Dec 2009
Location: Clinton, Iowa
Posts: 112
I am not 100 %. But it don't matter what wire you go with as long and you have one wire power and one ground. Its magnetic current will go either way. I have never wired a trailer that the wires where all messed. I've seen them where they all have one common ground and one at each wheel. I like the one common though. Hope this helps. Could just try it put wired together the press brakes and see what works also.
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Old 02-14-2010, 11:24 PM
igotdiesel2 igotdiesel2 is offline
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Join Date: Feb 2009
Location: Indianapolis, IN
Posts: 135
overtime is right. Just make sure both wires on both sides are the same. Mags go either way on current. I have rewired several trailers and I just make sure they are the same. I also WILL NOT ground my trailers through the hitch/ball. I always ground through the plug. -Jason
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