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Old 05-20-2015, 09:05 AM   #1
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Electric Trailer Brakes

I just purchased a 2015 Seneca 37 HJ and need to add an electric trailer brake controller. Looks like all the wires are there at the trailer socket. If it is prewired, where are the wires located under the dash for the brake controller? Thanks!
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Old 05-21-2015, 07:44 AM   #2
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My Ford E450 has the brake controller wires behind the coin holder on the dash. Pop the coin holder down from the top side. The blue wire is there, but use your meter to find the 12volt hot wire and the 12 volt wire the is the brake switch lead.
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Old 05-21-2015, 08:04 AM   #3
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in my 2011 gmc 1500 the wires are under the dash near steering column and all labeled as to what is what for the brake controller
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Old 05-21-2015, 09:08 AM   #4
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It depends on the tow vehicle and year. Some trucks maybe prewired for a controller but may require you to solder or crimp on a connector, others have a connector by may require an adapter. Others (like Chevy) may require you to hook up certain wires under the hood for your 12v charge wire and 12v power lead for the controller...and you need to supply fuses for both. If you post your TV info, we can help you more. Etrailer.com also has good info.
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Old 05-21-2015, 09:26 AM   #5
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Quote:
Originally Posted by raymoe3641 View Post
I just purchased a 2015 Seneca 37 HJ ...snip
Congratulations and welcome to the forum.
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Old 05-21-2015, 09:40 AM   #6
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It all depends every year the chassis manufacture changes this.. but the first place I would look is the under dash fuse box you just might see a spot to plug in the brake controller..
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Old 05-21-2015, 10:17 AM   #7
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It definitely varies by maker!


My 2003 F350 had 4 wires tucked above and inboard of the gas pedal. SWMBO's 2009 Tacoma had a plug above the parking brake pedal and the mating connector with wires in the glove box.


Definitely use a meter to determine +12V, ground, brake pedal applied and output to trailer's brakes. Double-check continuity on that last one all the way to the trailer.


Also double-check that +12V breakaway battery charge is functioning.
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Old 05-21-2015, 12:19 PM   #8
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If it's a Ford chassis, yes. It's prewired from the factory. Most likely, behind one of the coin/utility trays to the right of your right knee
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Old 05-21-2015, 12:28 PM   #9
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If it is a Ford chassis and you use the Ford controller, you'll need to replace the brake master cylinder and have the vehicle flashed on an IDS. If you're adding an aftermarket controller, it should be Plug-N-Play. I have heard instances that even with an aftermarket controller, you MAY have to get it flashed.
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Old 05-21-2015, 01:24 PM   #10
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His Seneca is on a Freightliner chassis but if the trailer plug near hitch is wired with all 7 wires there should be a pigtail under the dash where the controller will be connected. Look for it close to brake pedal tied up out of the way.


The pigtail could have a plastic plug on it or it could just be cut wire ends taped off. There will be four wires, two larger than the other two. Common colors used are Red, Black, Blue and Gray but your wires could be different. I have no experience with Freightliner (although I wish I did!!)


Congrats on a sweet RV - may it keep you safe wherever you go
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