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Old 10-18-2018, 11:54 PM   #1
Sudsy
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Default Electric Trailer Brake Connection

On my 2005 Sun Voyager I want to add an electric brake system. I have the controller and understand the wiring. My coach is in storage right now but I was wondering if anyone here has done this job. Right now I have basic trailer wiring. A four pin rubber connector. I want to install the seven pin round receptacle on the coach. Will I find a connector in the rear of the coach underneath that provides for the seven pin install. Next part... Is there a connector under the dash that is for the brake controller. (or am I going to need a new wire ran from front to back)


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Old 10-20-2018, 05:21 PM   #2
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Not sure about that, mine has both a flat 4 and 7 pin, so there was brake controller wiring up front, but still hard to locate
Good luck
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Old 10-20-2018, 09:44 PM   #3
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Thanks, that will at least make me look harder!


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Old 10-28-2018, 11:56 AM   #4
km7648
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I've done this upgrade on several RVs and one thing stands out; do you have the blue electric brake wire at or near the trailer hitch?

If so, the upgrade will be easier as that blue wire runs up to the brake pedal area and very likely to the factory chassis connector for the brake controller. They are often tucked up and attached to the steering column.

I suggest starting at the four pin connector and trace the wires for 2-3 feet. Hopefully, you will find that blue wire, taped back and ready to add to your 7 pin connector.

If you're really lucky, the same track-back will lead you to the 7 pin.
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Old 10-28-2018, 01:01 PM   #5
jamesham
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Default Extra wires were missing

On my Gulfstream, the blue brake wire was missing when I added the 7 pin connector to the existing 4 pin. I decided to use a #12 grounded orange extension cord and cut off the ends to run 3 wires front to back. I used one wire for the blue brake wire, and another for the 12 volt feed to the trailer or extra lights for the Toad. Used the third wire for a heavy ground which is really extra since the 4 pin connector already had a lighter-duty white ground wire.

Purchased the appropriate chassis to controller wiring adapter for under the dash, but never did find a mating connector. I concluded Gulfstream deleted that connector or used it for something else, so I cut and spliced as necessary.

My new 2019 Ram truck came with factory tow package, and the 7 pin connector is a flat blade connector rather than the round 7 holes. Another adapter purchase was required to be able to tow trailer with flat blade or round hole connector. Is this common? I thought the RV world used flat blade and semi trucks used round pin?


Quote:
Originally Posted by Sudsy View Post
On my 2005 Sun Voyager I want to add an electric brake system. I have the controller and understand the wiring. My coach is in storage right now but I was wondering if anyone here has done this job. Right now I have basic trailer wiring. A four pin rubber connector. I want to install the seven pin round receptacle on the coach. Will I find a connector in the rear of the coach underneath that provides for the seven pin install. Next part... Is there a connector under the dash that is for the brake controller. (or am I going to need a new wire ran from front to back)


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Old 10-28-2018, 01:42 PM   #6
km7648
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Quote:
Originally Posted by jamesham View Post
On my Gulfstream, the blue brake wire was missing when I added the 7 pin connector to the existing 4 pin. I decided to use a #12 grounded orange extension cord and cut off the ends to run 3 wires front to back. I used one wire for the blue brake wire, and another for the 12 volt feed to the trailer or extra lights for the Toad. Used the third wire for a heavy ground which is really extra since the 4 pin connector already had a lighter-duty white ground wire.

Purchased the appropriate chassis to controller wiring adapter for under the dash, but never did find a mating connector. I concluded Gulfstream deleted that connector or used it for something else, so I cut and spliced as necessary.

My new 2019 Ram truck came with factory tow package, and the 7 pin connector is a flat blade connector rather than the round 7 holes. Another adapter purchase was required to be able to tow trailer with flat blade or round hole connector. Is this common? I thought the RV world used flat blade and semi trucks used round pin?
The round plug has become the standard on RVs as the extra "charge" and "brakes" wires are included. With an RV wired this way, it's very easy to use an adapter to step down to the 4 plug setup. Impossible to go the other way.
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