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Old 07-18-2017, 12:56 PM   #1
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Brake controller

I seem that my 5th wheel brakes are not working. How can I tell if it is the brake controller or it is a problem in the 5th wheel. All lights work so I know the cable is plugged in properly. What pin number on receptacle are for the brakes.
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Old 07-18-2017, 12:58 PM   #2
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Pin 2 should be Blue
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Old 07-18-2017, 02:20 PM   #3
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Have a helper press the brake pedal while you check the juice at the trailer plug. Lots of vehicles don't complete installation of the wiring harness + relays + fuses to activate the trailer brake circuit. If the trailer brake circuit is not "hot" when someone mashes the brake pedal, then you have to figure out which relay/fuse is missing.

Here is a diagram of an RV 7-pin plug:

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Old 07-18-2017, 02:44 PM   #4
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Pull the breakaway switch and see if the brakes come on fully.
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Old 07-18-2017, 07:23 PM   #5
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Quote:
Originally Posted by lynnmor View Post
Pull the breakaway switch and see if the brakes come on fully.
Provided the battery that powers the break-away switch is charged and working properly, that will tell you whether the trailer brakes are working. That's usually the RV house battery., not the TV battery.

But it won't alert you to a trailer plug that has no power to the trailer brake pin. The trailer brakes can work great with the pulled breakaway switch, but not work at all when you step on the brake pedal if there is no power to the trailer brake pin in the trailer plug.
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