Hookin up trailer brakes.. please help - Ford Powerstroke Diesel Forum
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post #1 of 21 Old 03-01-2011, 09:29 PM Thread Starter
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Hookin up trailer brakes.. please help

So i went to hook up my brake box today, got it mounted to the dash and everything fine. I took off the fuse panel and after talkin with Reese TowPower on the phone i found the grey box that the brake box plugs into. So i hooked up to the trailer and nothing? So i unplugged the box from under the dash and got out the voltmeter and im not reading anything from the plug with the switch on or off, but from the 7 prong plug on the back of the truck i've got juice?

Any ideas?


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post #2 of 21 Old 03-01-2011, 09:46 PM
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Ford leaves the fuse for the trailer brake and "HOT" wire fuse out of the fuse box. I can look tomarrow to tell you which ones they are. If you installed those fuses then I need a little more info.
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post #3 of 21 Old 03-01-2011, 09:47 PM
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BTW I install trailer brakes for my dads RV place.
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post #4 of 21 Old 03-01-2011, 09:48 PM Thread Starter
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Quote:
Originally Posted by KnockingDiesel View Post
BTW I install trailer brakes for my dads RV place.
I checked with powerstrokehelp.com and i have all the right fuses and relays in place.


Ford F250 Ext Cab Short Bed 7.3L PowerStroke
S&B Cold Air Intake
ATS Ported Shroud Housing
Straight Pipe
Waste Gate Unplugged
Glowshift Gauges Boost, Trans, EGT
*DP Tuner coming soon*


And YES this is the sh*tiest looking hay you'll ever see
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post #5 of 21 Old 03-01-2011, 10:16 PM
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some times the traileiler brakes are not properly grounded I ran into that problem with a F150. While grounded on the truck (body) there was no reading but when using the ground wire in harness plug in ("gray box") i got a reading. next is follow the entire wiring from the seven pin all the way to the cab. if you got the truck new then its not likley that ther will be a problem with the wiring but preowned vehicle there is a world of posibilities.
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post #6 of 21 Old 03-01-2011, 10:16 PM
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^^traileier lol Im gettin tired
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post #7 of 21 Old 03-01-2011, 10:46 PM Thread Starter
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My mom had the truck before me and we decided to swap trucks. She had a box installed In it and it worked fine? Maybe the box I have isn't for a f250, it's a tekonisha voyager?


Ford F250 Ext Cab Short Bed 7.3L PowerStroke
S&B Cold Air Intake
ATS Ported Shroud Housing
Straight Pipe
Waste Gate Unplugged
Glowshift Gauges Boost, Trans, EGT
*DP Tuner coming soon*


And YES this is the sh*tiest looking hay you'll ever see
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post #8 of 21 Old 03-02-2011, 08:51 PM
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I had a voyager on my truck until it started smoking for no reason while not connected to a trailer. I grabbed the cheapest one we had on the shelf and have been using it since about 1 1/2 yrs with no trouble it operate tandem duallies on a 48ft flat bed recovery trailer.
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post #9 of 21 Old 03-02-2011, 08:58 PM
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Almost all trailer brakes have a 4 wire setup. Blue for the "brake wire" (which goes from the controller to the trailer), Black or Red for the "hot wire" (which goes from a power source to the controller), White for the Ground wire and the fourth color varies by manufacturer but its for synchronizing the trailer and truck brakes. It basically connects to your brake light switch that is located on the upper part of the brake pedal so when you hit the truck brakes it activates the trailer brakes.
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post #10 of 21 Old 03-02-2011, 09:01 PM
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Worse case scenario you can completely bypass the truck harness with out affecting the truck but since you had one on there before its more than likely something minor. Good luck with your install. If you don't get it p.m. me and I'll get back on here to further trouble shoot.
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