Trailer Troubleshooting?

[tex25025]

Can you (or) have you jacked the trailer up & run a hot wire straight from the batt. & connect it to the hot wire going to the trailer brakes ? ( without going through the brake controller ) If the wheels lock down doing this , I would say it is the controller.

Thing is and this is what has got me if it is the controller particularly since it has worked up until now, is that I hooked up my truck to the horse trailer and the system worked then. The difference between the horse trailer wiring and the flatbed wiring is that the horse trailer doesn't having any wire on just the accessory position and on the flatbed I just have right and left turn, brakes, and ground everything else is open.

 

[KICK]

its fairly common for Green to be right turn-brake

Yellow to be left turn/brake

brown to be running/tail lites

rest of wires are ground and brakes and possibly accesory

 

[Egon]

Trailer wiring does have a set standard. A site.

Trailer Wiring Diagram For 4 way, 6 way and 7 way circuits

Have you checked the connections at the back of the truck where the plug connections are spliced in to the truck wiring? They may corrode over time.

A meter may help for checking things out.

 

[George2615]

The last poster (Egon) has the link you need to see. The blue wire is for the brakes as shown. Using a 12V jumper wire touch it to the trailer plug blue wire while someone checks each wheel on the trailer to see if the magnet is energizing. If not you may have a break in the wiring or a bad magnet in the hub.

The most common problems are corrosion in the wiring plug terminals, corroded wire inside the truck or trailer plug, bad or missing ground, broken wire under trailer possibly ripped off by a road hazard. I rarely get more than a year on mine before I have to rewire the plug. Winter road salt around here just gets inside the plugs and works its magic.

 

[Farmwithjunk]

Link wouldn't work, said the page was no longer valid.

Try this one. Same site but a link that should work.

Farmco Distributing Inc

Or search "Dexter Axle" . Dexter makes the lions share of trailer brakes.

 

[KICK]

after you wire a new one, I usually seal the end with RTV.

also some grease in the plug.

doesn't stop corrosion but it does slow it down.

 

[George2615]

I do use grease on mine. Have tried silicone sealant but the salt always finds a way inside. My 2006 tilt bed trailer with need a repaint this year already. It looks about ten years old right now. I don't mind the snow, just hate the overuse of road salt.

 

[Stimw]

How I check each wheel brake is I hook up a battery charger to the plug and run an extention cord to the rear. Jack up each wheel and plug in cord to power the brakes and spin test.
All trailer plugs and recepticals have a specific pin position and wire has a color code. Some people don't follow the codes.