My lights all work great on the PU but when I connect the trailer the lights work but no brake lights or turn signals on the trailer. Is this a fuse or a bad connection?
If all the lights work properly with the trailer wiring not connected then the truck itself is fine. If attaching the trailer wiring causes the lights to permanently stop working on the truck then you are blowing a fuse and it will need to be replaced. Your owners manual will show you where the fuse panel is. You should be able to check the wiring plug at the back of the truck to be sure it is working properly with a test light and a helper. If the power for signals/brakes etc are not all working at the plug, then trace back and fix these. If all is good at the truck's plug, then the trailer wiring must be faulty. Again, go through it and fix anything that is broken or corroded. Of course it goes without saying, make sure all the bulbs are good.
SOURCE: Trailer wiring 7 way
dO NOT SPLICE WIRES.. You bought a 45000 dollar truck, spring for a wiring T --25 bucks.. ( plugs between main harness and Tail lights.. ) --Available at most good auto parts.. Painless wiring also has a kit.
If you did already cut or splice into your wires, take that **** loose.. Shrink wrap the dammage.. Silicone over srink wrap.. Wire will corrode.. if you did manage to get spliced wires to work,-- in a few years or sooner you will have issues with the connections..Can you say short circuit.. Moisture and loose connections are a thing of the past with sealed tap in wiring.. Plug and play..
If any of this is over your head, get a friend who knows, or a tech to help.. Don't jerry rig a 45,000 dollar new Truck.. Come ON..!!!!!
SOURCE: brake and turn signal lights stopped working on my 1996 Ford E150
You might have cut a wire or it could have broken or disconnected. Try tracing the wiring where you hooked up the trailer you may find one broken or disconnected.
SOURCE: Looking for a wiring diagram for a 2006 Ford Expedition
7way- black is 12volt (power), brown, running lights, yellow is left turn signal and stop light, green is right turn signal and stop light, white is ground, blue is brakes, and orange is aux power (can be back up lights, if trailer equipped w/ them). 6way is the same, minus orange wire. I have run into some variations to the above color codes (brown, yellow and green only-sometimes these 3 are different than stated, but only mixed as that group, as to what they control- example would be green is running lights, brown and yellow are turn signal and stop lights, the others should be as stated), if you have any trouble with things not working properly, it may be due to these variations, although the above are pretty standard. If you have an ohm meter you can check as you go (check for power at black wire- should be constant 12v, turn on turn signal and check for power-it will fluctuate from approx. 12 volts to 0 volts as the signal power pulses in the wire) hit the brakes, blue wire should show power, etc. Let me know if you need more help as you go.
SOURCE: 2003 Dodge Ram 2500 diesel 4x4 wiring diagram
TPIM PROBLEM , MUST HAVE COMPUTER FLASHED AT DEALERSHIP
SOURCE: need fuse panel diagram for 2004 ford f150 stx
If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp
The fuses you are looking for are cab fuse panel fuses #36 & #42 are the stop / turn lamps for the trailer tow adapters.
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