Trailer brake help needed

224 Views 7 Replies 6 Participants Last post by wnstwolf, Jul 23, 2002

Engineer Ed

Discussion Starter · Jul 22, 2002

I purchased a new 23' enclosed trailer earlier this year.
Had a brake booster installed in tow vehicle.

Since I have been moving (house-hold stuff) I have noticed that my trailer brakes are not working.
I have the 7 pin "hidden hitch" on the rear of tow vehicle but no clue as to the pin-out.
Anyone have the "generic" pinout for this connector. I am going to assume it's wired the same for all trailers to make it accept any tow combination.

First things first, I noted that the 12 volt battery on the trailer had gone dead. I put it on the charger for an hour before a road trip.
Brakes still did not work.
I have the supply voltage to the brake controller and the ground is good.
Brake controller LED does not come on.
The input from the brake pedal checked out OK, and there is +5.23 volts out from the controller (blue wire) when the brakes are applied.

Anyone have any ideas as to what may be wrong?

I am going to assume that the output voltage on the blue wire may vary depending on the brake controller soft/hard brake setup??? Is this voltage pulsed depending on hard/soft brake setup?

Need help. I am not going to attemp towing my Cobra until this is sorted out.

Ed
FFR1997K

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TAZ

· #5 · Jul 22, 2002

Ed,

BTW, on some pre-wired trucks (I've got a 2001 GMC Sierra 1500 w/ Heavy Duty Trailering Package.) It's all wired up except the power to the auxillary pin. Mine came that way, but they gave me a module that I wire in to provide variable power to that auxillary pin (when applying the brakes.)

This may be the case with your truck.

I hope this helps.

TAZ

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