I have a 2005 F-250 with 6.0 diesel. I am trying to build a trailer with a work light that I can turn on by a switch on trailer. I thought I could bring in the power from the aux/12v prong on the factory 7 prong. (you have; ground, left, right, running, backup, electric brake, & 12v/aux) Why would mine not be hot or how do I make hot??? Thanks, Russell
7-pin trailer plug pin 5 (Orange) should be hot when the ignition is in RUN only. It is not an ALWAYS HOT circuit.
Verify presence and integrity of fuses F2.27 & F2. 107 and that the trailer tow battery charge relay has been installed in the fuse panel.
Do you have an electronic brake controller installed? If not, you can make the electric brake connector pin ALWAYS HOT by installing a jumper at the controller plug under the dash.
Steve
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Think about it: Ignorance can be addressed through education but you can't fix stupid! ...apologies to Ron White
I'd suggest NOT using those diagrams since they don't match the 2005's factory wiring!
Steve
A quick check with a test light will tell you if they are correct or not. I have found them to be pretty much standard. The 6 pin connectors are right on. There may be some variation in the 7 way, that is why I always check with a test light.
Also, one never knows if it has been changed or not. I have a couple of contractors that I maintain their trailers for. Their vehicles are Dodges, and the diagrams are correct for these vehicles. jd
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In memory of my beloved Sandy, 9/28/53 - 1/24/03
I found out on the old style 7 prong plugs, there are two different ways of wiring the 7 prong. I think Ford wires their's differently, because two different people I know with 90's Ford pickups, bought a 7 prong to 6 prong adapter, and on both, the trailer brakes will not work. It seems the local stores have one adapter they sell, but I looked in a towing co.'s catalog, and they sell two different adapters, and it looks like the brake wire is one of the differences.
That 2005 plug looks totally different from anything I have seen on the earlier trucks.
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That 2005 plug looks totally different from anything I have seen on the earlier trucks.
The pinout is identical to my 97.
However, I'd suggest that the choice by the technical illustrator to use round terminals in his/her drawing was probably a poor choice as the terminals are actually rectangular.
Steve
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Think about it: Ignorance can be addressed through education but you can't fix stupid! ...apologies to Ron White
However, I'd suggest that the choice by the technical illustrator to use round terminals in his/her drawing was probably a poor choice as the terminals are actually rectangular.
Steve
Yes, the round prongs in the diagram are what threw me.
Thanks for all the help! I have tested the F-250 and my wifes 2001 yukon and the wiring is exatly the same on the 7 prong (the covers for the plug-ins have the diagram on them). The top right prong is positive/aux and the middle is back/up. Neither vehicle has any current with key on or off so that is my problem. I just got home from work and now I will go check for those fuses.
If you really want the power to be on always, remove the relay and make a jumper to make the contacts the relay normally would, Then you will always have power at the back. I'd suggest using 12 or 10 gauge wire for the quick jumper. Crimp a couple of male spade connectors and you're done.
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Wishin I was still camping somewhere....
-Mike
Checked for circut 107 and relay 301 and they are there. Turned key to the run position and still no power to that 12v/aux prong. I did turn lights on and checked to see if my test light was working and its fine. Could the circut or relay be bad?? Yes i do have an electric brake factory ford setup.
Russell
Its possible they are bad, if it were me, I'd pull the relay and use the test light there. Should get light on one of the coil slots and one of the contact slots. If you get light at the coil slot and not the contact slot. The fuse is more than likely bad, head that route, if they both light, it could be the relay, start with that, usually there is one for shift on fly or revers aux lighting that you can use to test with.
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Wishin I was still camping somewhere....
-Mike
7 prong trailer plug-in 12v aux not working
2005 F-250 4X4 CC/SB 6.0 PSD, medium wedgewood blue
