Installing a Brake Controller on a 1999 GMC Conversion Van
Question:
Having trouble finding out which wires I hook into to install the brakes system for hauling our trailer.
asked by: Jeff
Expert Reply:
There are two possibilities. If your 1999 GMC Conversion Van has a tow package, there will be a port in which to plug in a wiring adapter from the Hopkins Agility Electric Brake Controller, # HM47294, to the port. It is part # HM47795. I have included a link to the installation details below. You would then need to install an Adapter 4 Pole to 7 Pole and 4 Pole, # 37185. But, if the van has a round plug with a cap inside the driver side frame rail instead of a bundle of wires in the jack storage compartment, use Replacement Multi-Tow 7-Way and 4-Way Trailer Connector, # 30955.
If you do not have a tow package, you will first need to install Tow Ready Custom Fit Vehicle Wiring, # C55338 (installation details linked below). And then hardwire a 7- and 4-Way installation Kit, # ETBC7.
I have included a link to an FAQ article on installing a brake controller from scratch and two videos featuring the installation of an ETBC7 kit.
One tip I can give you is to use a circuit tester like # PTW2993, to find the stop light wire on the brake switch. The brake switch is located above the brake pedal. Using the circuit tester, find the wire that carries a signal ONLY when the brake pedal is pressed. It should not show a signal at any other time (when the blinkers are on or when the vehicle lights are on) just when the brake pedal is pressed.
Products Referenced in This Question
Replacement Custom Multi-Tow 7-Way and 4-Way Trailer Connectors
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- No Converter
- Custom Fit
- 4 Flat
- 7 Round - Blade
- Hopkins
more information >
Adapter 4-Pole to 7-Pole and 4-Pole
- Trailer Wiring
- Wiring Adapters
- Multi-Function Adapter
- 4 Flat
- Plug and Lead
- 4 Flat
- 7 Round - Blade
- Hopkins
more information >
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- No Converter
- Custom Fit
- 4 Flat
- CURT
more information >
Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Accessories and Parts
- Trailer Brake Controller
- Installation Kits
- etrailer
more information >
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