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Old 11-16-2009, 07:52 AM   #1
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1956 22' Flying Cloud
Dallas , Texas
Join Date: Jan 2008
Posts: 264
99 Suburban pre-wired for brake controller?

My 1999 Suburban came from the factory with the "towing package," and now I need to wire it for a brake controller. Does anyone know if it should be pre-wired with a connector plug for a brake controller? If it is pre-wired, what (and where under the dash) should I look for in terms of wires and connectors?

Thanks, Hank

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Old 11-16-2009, 08:31 AM   #2
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1991 34' Excella
Princeton , New Jersey
Join Date: Aug 2003
Posts: 6,318
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Not sure the 99s came prewired. My 97 had the wiring in the harness but did not have the receptacle at the rear bumper or a connection forward.

Take a look under the hood just below the steering column for 4 wires folded back on themselves and taped. Also look inside the drivers side rear frame member. There should be a hole on the inside of the frame about 15 ins. from the end of the frame. The wires will be inside that hole folded back inside.

2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

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Old 11-16-2009, 09:12 AM   #3
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1956 22' Flying Cloud
Dallas , Texas
Join Date: Jan 2008
Posts: 264
HowieE, thanks for the information. I have found the wires at the rear of the vehicle, and I will see what I can find up front. Hank
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Old 11-16-2009, 09:45 AM   #4
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1975 Argosy 24
Malakoff , Texas
Join Date: Apr 2009
Posts: 490
You will want to buy the adapter that
will connect the brake controller to your
TV. Two small screws to mount. If prewired
correctly, you should have a 7-pin outlet by
your bumber. A notepad and a simple test light
will be useful when testing and taking notes
at the bumper.

A couple of schematics printed would be useful. They
can be found and printed here in the forum.

<From TV> and <into trailer> TWO PARTS

Left blinker
Right blinker
Running lights
Brake lights
Backup lights
Power for brakes
Power for battery charging from TV to trailer
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Old 11-16-2009, 05:29 PM   #5
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1985 27' Sovereign
Defiance , Ohio
Join Date: Aug 2007
Posts: 3,254
I think 2000 and later Subs came prewired from the factory. LJH
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