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Old 07-28-2009, 12:21 AM   #1
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1967 electric brake wiring

I'm having problems with the wiring on my electric brakes. My 1967 Overlander manual says the yellow wire on the umbi cord goes to the brakes. I found that at the splice under the front access cover. At the wheels there are 2 wires, a white and a black. Where does the second wire come into the picture and where do I find the ground to the frame? I have 2 wires at each wheel so I know there has to be splices under the floor pan.
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Old 07-28-2009, 07:22 AM   #2
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If electrical code is followed, the black would be the hot, or 12 volts from the controller. Anyway, the other wire, the white, will be the ground wire and it should go to frame ground on the trailer, but more inportantly, it must to ground on the tow vehicle.
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Old 07-28-2009, 09:13 AM   #3
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In a DC circuit there is no need to follow polarity. Attach one of the white wires coming from the magnet to the frame and the other to the brake supply wire. Newer Airstreams bring 2 wires back to the wheel, one 12 volt supply and one ground. If you have this situation it still makes no difference which way you attach the wires at the magnet.

Before you wire the brakes and just to be sure you have voltage at the wheel I would have someone apply the manual brake controller and then measure the voltage of the supply wire to frame ground. This is just a check that may save you some time if things don't work after you wire the magnets. At least you will know the supply voltage is there.
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Old 07-28-2009, 09:44 AM   #4
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Ditto on you don't have to worry about polarity on hooking up the brakes. On my 71 the other brake wire (not the yellow) goes back to a ground at the umbilical. You could also ground all the brakes to the shell or frame and accomplish the same thing as the trailer 12v system is also grounded to the frame/ shell.
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Old 07-28-2009, 11:36 AM   #5
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Quote:
Originally Posted by HowieE View Post
In a DC circuit there is no need to follow polarity.
Actually, to be most technically correct, there is MOST DEFINATELY need to follow polarity rules in a DC circuit. Just not in an electromagnetic DC circuit, or perhaps an ungrounded light circuit.

If you don't believe me, try reversing the polarity to the radio in your trailer and see what happens....a DC circuit.
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Old 07-28-2009, 12:00 PM   #6
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Actually, to be most technically correct, there is MOST DEFINATELY need to follow polarity rules in a DC circuit. Just not in an electromagnetic DC circuit, or perhaps an ungrounded light circuit.

If you don't believe me, try reversing the polarity to the radio in your trailer and see what happens....a DC circuit.
Lets try and keep it real here.

I used to be involved with the design signal recovery circuits that distinguished a 1,000,000 to 1 signal to noise ratio, but did not think it necessary to relate that here. He just want to hook up his brakes and go camping.
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Old 07-28-2009, 12:03 PM   #7
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I would trace all of your wires, just because it's yellow up front does not mean it's yellow at the rear or mid area. My 64 had a couple of splices near the front which made the wires near the back different colors. Such as yellow at the cord and blue at the brakes (for power). I now have all of my wires in the entire trailer numbered.

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Old 07-28-2009, 12:20 PM   #8
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Lets try and keep it real here.

I used to be involved with the design signal recovery circuits that distinguished a 1,000,000 to 1 signal to noise ratio, but did not think it necessary to relate that here. He just want to hook up his brakes and go camping.
Actually, Howie, I am trying to keep it "real". When you make a blanket statement like "In a DC circuit there is no need to follow polarity", it might possibly lead the OP into a bad situation in the future because neither of us know his understanding of DC theory, or anything else for that matter.
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Old 07-28-2009, 12:41 PM   #9
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There is an access plate on the underside of the '67 Overlander, forward of the door and on the curb side. This is where I found my umbilical spliced to the trailer wiring. I pretty much ignored the colors and tested each wire to determine what was what.
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