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Old June 30th, 2010, 06:38 PM   #1
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Default Why Four Wires on my trailer brakes?

I'm in the process of fixing up my trailer. I'm not sure what brand it is but it's heavy, 2800lbs empty. On the back side of the backing plates there are four wires. Two of them go to the magnet for the brakes, the other two go to the spindle. Does anyone know why these two wires would go to the spindle?

A friend of mine that has dabbled in heavy equipment repair says that he's never seen anything like that before. I'm not sure who else to ask.
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Old June 30th, 2010, 07:15 PM   #2
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I would assume the axle uses a ground? in the case of the backing plate the assembly would be a ground with power supplied to the magnet? so that being said they are probably static wires to prevent current draw through a bearing. if that were to happen they would arc even while turning and eat the bearing in a very short time.
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Old June 30th, 2010, 07:55 PM   #3
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So I should hook three of the four wires coming from the backing plate to the ground?
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Old June 30th, 2010, 08:01 PM   #4
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http://www.etrailer.com/faq-wiring.aspx

I am looking for an old diagram to show the wires. this is the best current site I have.
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Old June 30th, 2010, 08:23 PM   #5
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I've heard of this somewhere but I can't remember where. Thats so you can bring the power and ground to both sides by only running wires to one side. The two going into the spindle come out on the other side through that spindle. so on the side that your lead wires comes to, you hook up two to power and two to ground, then on the other side you just wire the two together. one set for power and one set for ground. Its all so you don't have to run a wire on the outside of the axel.
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