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05-20-2015, 08:05 AM
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#1
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Member
Join Date: Nov 2014
Location: Baton Rouge
Posts: 36
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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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05-21-2015, 06:44 AM
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#2
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Junior Member
Join Date: Feb 2015
Location: Carthage
Posts: 16
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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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05-21-2015, 07:04 AM
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#3
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Senior Member
Join Date: Mar 2012
Location: Central Connecticut
Posts: 564
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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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2011 GMC Serria Ext Cab LB
2012 Jayflight 22FB
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05-21-2015, 08:08 AM
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#4
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Senior Member
Join Date: Mar 2013
Location: Kansas City
Posts: 1,712
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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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2018 28BHBE
2017 Ford F250 XLT, 6.2 gasser
2013 26BH (traded)
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05-21-2015, 08:26 AM
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#5
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Senior Member
Join Date: Dec 2014
Location: FL
Posts: 11,281
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Quote:
Originally Posted by raymoe3641
I just purchased a 2015 Seneca 37 HJ ...snip
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Congratulations and welcome to the forum.
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Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
SOLD:2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18, 365+ '20
SOLD: 2006 Ford F350 PSD, 4WD, CC, LB, SRW, Camper pkg., 375,000mi
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!
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05-21-2015, 08:40 AM
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#6
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Senior Member
Join Date: Jun 2010
Location: Saskatoon Sask Canada
Posts: 10,720
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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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Seann
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 900watts of solar, Lithium batteries (400amp hour), 2000 watt (4000 surge) whole house inverter.
145days /2023 2022/151 2021[/COLOR]
93/2020,157/2019219/2018 206/2017,215/2016, 211/2015, 196/14, 247/13, 193/12
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05-21-2015, 09:17 AM
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#7
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Senior Member
Join Date: May 2015
Location: Campbell Hall
Posts: 2,835
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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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TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!
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05-21-2015, 11:19 AM
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#8
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Senior Member
Join Date: Mar 2015
Location: Abingdon
Posts: 6,177
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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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2013 Jayco Eagle 328 RLTS
2021 Keystone Montana 3121RL
2013 F350 6.7L 4x4 CCLB
W/Air Lift air bags (front & rear)
Equal-I-Zer™ WDH & B&W Companion
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05-21-2015, 11:28 AM
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#9
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Senior Member
Join Date: Mar 2015
Location: Abingdon
Posts: 6,177
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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.
__________________
2013 Jayco Eagle 328 RLTS
2021 Keystone Montana 3121RL
2013 F350 6.7L 4x4 CCLB
W/Air Lift air bags (front & rear)
Equal-I-Zer™ WDH & B&W Companion
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05-21-2015, 12:24 PM
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#10
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Senior Member
Join Date: May 2015
Location: Las Vegas!!
Posts: 158
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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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2015 Jayco Precept 35UN
Towing JEEP TJ with Roadmaster plates and bar w/Blue Ox Patriot brake
OR
an Aluma low bed trailer with HD Road King and/or Polaris RZR onboard
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05-21-2015, 12:28 PM
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#11
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Senior Member
Join Date: May 2015
Location: Campbell Hall
Posts: 2,835
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The way I found it in my F350 was using a signal tracer (for phone and house wiring) hooked to the electric brake feed at the 7 Pin connector.
Then probed under the dash for the best signal.
[Sheepishly]The Tacoma had it the manual.
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TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!
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05-21-2015, 12:29 PM
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#12
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Senior Member
Join Date: Mar 2015
Location: Abingdon
Posts: 6,177
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Ohhhhhhhhhhhhh....
Oh well. Tried. LOL
__________________
2013 Jayco Eagle 328 RLTS
2021 Keystone Montana 3121RL
2013 F350 6.7L 4x4 CCLB
W/Air Lift air bags (front & rear)
Equal-I-Zer™ WDH & B&W Companion
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05-21-2015, 12:31 PM
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#13
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Member
Join Date: Nov 2014
Location: Baton Rouge
Posts: 36
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Thanks everyone for your responses! I will trace it back from the rv socket tomorrow and see if the brake wire terminates under the chassis or actually makes it to the dash. Sure would be sweet if it did!
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05-21-2015, 12:33 PM
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#14
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Senior Member
Join Date: May 2015
Location: Campbell Hall
Posts: 2,835
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If the manufacturer bothered with the 7 pin connector and a trailer hitch, the 4 wires you need will probably be bundled together somewhere.
Like everything else, the bundle will be in the LAST place you look.
__________________
TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!
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05-24-2015, 02:38 PM
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#15
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Junior Member
Join Date: May 2015
Location: Albuquerque
Posts: 16
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Do any of the F450 units come with the brake controller from the factory? Most F350 Pickups and F450's have them pre-installed from the factory. I hate having the after market controller hanging off of the dash somewhere.
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05-24-2015, 04:45 PM
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#16
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Member
Join Date: Nov 2014
Location: Baton Rouge
Posts: 36
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Well. I am happy to report that my 2015 Seneca was prewired for the electric brake controller (not plug and play). For anyone interested the bare wire bundle located adjacent to the bundle directly over the accelerator is the wires for the controller. For some reason there are two blue wires for power to the brakes. You need only splice into one as they both go and come from the same tab on the RV socket.
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05-24-2015, 05:16 PM
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#17
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Member
Join Date: Apr 2015
Location: San Bernardino
Posts: 38
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Are they large blue wires, and smaller red wires?
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05-24-2015, 05:26 PM
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#18
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Member
Join Date: Apr 2015
Location: San Bernardino
Posts: 38
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Picture of what I have. I did not think these were the wires because of the size?
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05-24-2015, 06:32 PM
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#19
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Member
Join Date: Nov 2014
Location: Baton Rouge
Posts: 36
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That's them! For some reason about a foot away from the 7 pin RV socket the blue trailer brake wires split into two blue wires. The solid red is the hot. The red/white is the brake signal and the last one is the ground.
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05-24-2015, 06:39 PM
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#20
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Senior Member
Join Date: Nov 2011
Location: Where ever the boss says we're going.
Posts: 16,077
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Quote:
Originally Posted by raymoe3641
That's them! For some reason about a foot away from the 7 pin RV socket the blue trailer brake wires split into two blue wires. The solid red is the hot. The red/white is the brake signal and the last one is the ground.
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They might have run two instead of a larger wire to be sure you get full power to the brakes since it is a fairly long run. I would connect both coming from the controller.
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