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Old 06-25-2015, 01:22 AM   #1
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Trailer plug question

I recently acquired an old 2002 Avalanche. Turns out the vehicle trailer plug wiring was torn apart and shorted inside the plug. I replaced the plug but am having my doubts about the Electrical Trailer Brake prong as it is indicating about 12 volts on it with no brake input and no trailer connected(battery is sitting at 13.7 with motor running). I read one forum where they stated not unusual to have voltage as it is sensor to detect if trailer brakes are plugged in. Any input before I start trouble shooting my brake controller??
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Old 06-25-2015, 09:08 PM   #2
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You didn't mention what brake controller you have. Check online to see if they have documentation available to download.
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Old 06-26-2015, 11:43 AM   #3
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There are 7 wires in your trailer wiring.

1. ground
2. left turn
3. right turn
(brake and emergency flashers use both the left and right turn wires together)
4. tail lights, marker lights

Those four wires are all that is in the "U-Haul" 4-flat-wire connectors.

5. trailer brakes: this wire is "hot" only when the trailer brake controller is sending juice to the electric (magnetic) trailer brakes

6. 12-volt hot = Battery charge = 12 volts (nominal) hot all the time the key is on.

7. Auxiliary = not normally connected to anything, but can be used for backup lights, porch lights, etc. This one is normally also "hot" all the time the key is on, unless the wiring has been modified to use backup lights.


Trailer Wiring Diagrams | etrailer.com
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Old 06-26-2015, 11:56 AM   #4
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Quote:
Originally Posted by POPPASMURF View Post
I recently acquired an old 2002 Avalanche. Turns out the vehicle trailer plug wiring was torn apart and shorted inside the plug. I replaced the plug but am having my doubts about the Electrical Trailer Brake prong as it is indicating about 12 volts on it with no brake input and no trailer connected(battery is sitting at 13.7 with motor running). I read one forum where they stated not unusual to have voltage as it is sensor to detect if trailer brakes are plugged in. Any input before I start trouble shooting my brake controller??
If you have a controller that tells you if it senses the brakes being connected you could have 12V on the pin. It would be a pull up resistor that was pulled down by the brake resistance to ground. The resistance of your voltmeter is probably many times the value of the brake resistance thus it will not not pull down the sensing line.
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Old 06-26-2015, 04:32 PM   #5
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I have a Voyageur trailer brake controller. I'm thinking nothermark may be right about the 12v on trailer brake. The Voyageur "senses" a trailer with electric brakes has been connected by lighting a green LED, as brakes are applied while moving- that colour changes to orange and red. I only need the electric brake controller once in a long while when I need to pull a trailer other than mine. My boat trailer has surge disc brakes- I was as concerned about damaging anything on my boat trailer, but I think all is as it should be now. Thank you all.
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