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-   -   F-250 trailer plug (https://www.offshoreonly.com/forums/trucks-trailers-transportation/349956-f-250-trailer-plug.html)

Sydwayz 09-25-2017 03:45 PM

1 Attachment(s)

Originally Posted by F-2 Speedy (Post 4584345)
doesn't work that way either, the only way to energize the pump is to pull the break away switch or put +12 direct to the blue wire.........

I'm assuming you have a battery on the trailer, correct? If so, does the brake controller actuate when the break-away switch is pulled and the truck is NOT connected?

Have you used a test light to confirm that you have power coming to the 12V hot pin out of the truck? Some trucks need to have a fuse inserted to make this happen, that's not there from the factory. This would be in the manual.

Also, some integrated/factory brake controllers, especially of that era were only designed to really with STRAIGHT ELECTRIC brakes. IF your truck is one of those, you need this:
Attachment 571022

That basically "fools" the truck into thinking you have Straight Electric (magnet) brakes; and allows your factory controller to work with an EOH trailer brake system.

F-2 Speedy 09-25-2017 04:02 PM


Originally Posted by Sydwayz (Post 4584346)
I'm assuming you have a battery on the trailer, correct? YES If so, does the brake controller actuate when the break-away switch is pulled and the truck is NOT connected? YES

Have you used a test light to confirm that you have power coming to the 12V hot pin out of the truck? YES Some trucks need to have a fuse inserted to make this happen, that's not there from the factory. This would be in the manual.

Also, some integrated/factory brake controllers, especially of that era were only designed to really with STRAIGHT ELECTRIC brakes. IF your truck is one of those, you need this:
Attachment 571022

That basically "fools" the truck into thinking you have Straight Electric (magnet) brakes; and allows your factory controller to work with an EOH trailer brake system.


no voltage present on the blue wire @ the truck plug until I engage the controller then theres 2.8 vdc on the blue wire no matter where the controller is set while truck not moving, Im gonna see if my neighbor is busy this eve, there may be a :nhl_fight: to see who gets trailer duty.....

575cat 09-26-2017 09:26 AM


Originally Posted by neva satisfied (Post 4584334)
The problem with bypassing the integrated controller is getting the aftermarket one to work without throwing a warning light on the dash.

I have no warning light . Do away with the factory setup mine never worked right down rite scary pulling 15k .

neva satisfied 09-26-2017 03:25 PM


Originally Posted by 575cat (Post 4584470)
I have no warning light . Do away with the factory setup mine never worked right down rite scary pulling 15k .


How did you by pass it?

F-2 Speedy 09-26-2017 03:42 PM

Soon as I get the brakes bleed, Ill hook it up crank it up to 8-9 and see if it works, my B inlaw ( Matco man ) in TX talked to a bud of his, 40 yr Ford mechanic and he said some work and some dont, it is true the early 05's like mine need to be moving and decelerating for the ECM to put out max voltage on the blue lead, if it doesnt work he said to install a dexter in cab controller.

575cat 09-27-2017 08:39 AM


Originally Posted by neva satisfied (Post 4584572)
How did you by pass it?

No warning ever came up . Prodigy is a plug & play unplug from the box and plug the new controller into the harness done .

F-2 Speedy 09-27-2017 08:44 AM


Originally Posted by 575cat (Post 4584710)
No warning ever came up . Prodigy is a plug & play unplug from the box and plug the new controller into the harness done .

it plugs into the dash harness ?? what brand truck

575cat 09-27-2017 09:13 AM

15 Ram 2500 , they should also have a harness for Ford , plug and play .

Sydwayz 09-27-2017 09:38 AM

I don't know that trucks that DO have an integrated controller have the option to use a "pigtail" like the other trucks that don't.

See this page (after you enter your truck details), and see the two pigtails you can buy, which plug in under the dash, and allow you to wire up an aftermarket controller.
Reese - Brake Controllers

This will them use the truck's factory wiring to carry the brake controller signals to the trailer connector on the back of the truck.

Some other info:
https://www.etrailer.com/faq-fbc_sd05.aspx

kvogt 09-27-2017 09:42 AM

replace your 05 factory controller with a Ford 07 factory controller. They did away with the minimum speed problem.


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