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Used Cars for sale - Used Trucks for sale [2329117847] Buy Used Cars

2004 Ford Explorer Trailer Wiring Troubleshooting

- Ford-Explorer

Forum Post
05/22/08 01:13
Beau Jenkins

2004 Ford Explorer Trailer Wiring Troubleshooting

Vehicle came with factory "4-flat" trailer wiring harness connector, right turn signal does not work at connector. Checked for power coming into connector-found none. Attempting to trace back wire to factory trailer wiring "tie in" point. Cannot locate junction of wires. Need help locating this point.

Tested two (2) major plugs on frame, under vehicle on driver's side midway of frame. When those plugs disconnected, no effect found at rear right lamp.

Right rear "vehicle" turn lamp functions fine, just not at trailer connection????

Request factory trailer connection tie-in point.

B. Jenkins

Archived Replies

This post has a total of 25 replies. The most recent 25 are shown below, you can view the complete archive here: 2004 Ford Explorer Trailer Wiring Troubleshooting archive. Your feedback, comments, opinions and questions are welcome and encouraged.

This forum post has messages dated from 05/22/08 through 04/14/11, please be sure to read all the messages. If you feel it is old or outdated, please follow up with a question or comment and someone may be able to update it, or reply with newer information if you have it.

05/30/08 16:55

the trailer wiring (turn signals are on a seperate line than the vehicle signals. It sounds like the fuse for the trailer line is popped. Check under the hood in the fuse panel for a blown 10-15 amp litle fuse. that should do it.
06/22/08 17:48

My green wire is also dead... 2000 ford ranger. has always been so. is this a ford defect? anyone know the answer yet?
07/14/08 13:40
Izen Lingenfelter

I am having trouble connecting my harness to the factory plug and getting power. I checked where the factory harness is and there is no power. i checked the fuses and found 3 fuses. one for the brake lights, one for right and one for left turn signal. i checked there and found that the brake fuse area has power but niether of the turn signal fuse plug is getting power. any suggestions
07/14/08 19:00
John Morris

Guys, you have a style of t/signal switch that is notorous for going out, so if your t/s lights are working and you're trying to hook up trlr wires just install saddleback wiring connectors and wire pig tails and connect them to your trlr light harness and remember, always hook up all 4 wires. 1 goes to R, 1 goes to L, 1 goes to Tail Lights and the other wire goes to ground.

All turn signal lights have 2 wires going to them and one is always ground. Same with the tail lights. The body of the vehicle is always the ground point, so@@@ with the switch on and either t/signal on hook up the trailer light on that side then switch the other side on to hook them up.

Then shut them off the t/s and turn on the tail lights so you can hook them up. And Black is always GROUND...

The color of the trlr hook up wires you use in any position doesn't really matter just so you use the black for the ground. A last note: If your wire harness doesn't have 4 wires just make sure to hook up a ground wire from the frame to the trailer hitch or trailer so you can get a decent groung thru the metal. Don't put grease on the hitch if you want a good ground with no ground wire connected...

07/14/08 23:14

THE GEM ISOLATES TURN AND STOP SIGNALS FROM THE OEM TRAILER CONNECTION! STOP SNIFFING THE HARNESS; Generic Electronic Module varies in location, my 1999 is on left rear fender.

Yes , separate Grounds are a "feature of the Ford trucks!

The ball hitch is not a good substitute for a good chassis connection which you should be able to make just about anywhere

at the rear of the Explorer.

07/28/08 14:29

I'm trying to wire my 2000 for Explorer with a 4 wire trailer harnes but can't seem to get the headlights and brake lights working. I can get one or the other but when I try to hook them up to work together, the headlights come on when I hit the brake. there appears to be a sepeerate wire for the headlights and brake lights on the Explorer. The wire colors don't match the 4 wire wiring diagrams I have.

Any idea as to how to wire this thing?

09/03/08 22:36

i'am haveing the same trouble but they did work
09/21/08 12:15

Have a 97 Explorer. Rewired an old snowmobile trailer. All connections on the trailer are good. When I plug into the jack on the Explorer I have taillights and turn signals however when the brakes are applied all the lights on the trailer go off. What is going on? The Explorer has the factory harness that comes with it.
09/30/08 11:17
Geo H

Problem is that the ranger has separate dir lites and brake lights. the trailer doesn't on the plug of the truck has 1 ground , 2tail lights, 3-4 right and left dir. This is so the lights will work with any trailer. If you get the diagram from ford in there EVTM you will find the problem. G
10/31/08 15:47
Chuck Hankins

I'm trying to connect a "wire-in" trailer hitch wiring kit to my 2001 Windstar. Have colors of the kit with the converter, but no idea what the colors of the vehicle wires are. When I attach the kit wires, what color vehicle wires do I plug into?
11/29/08 16:01

trying to install a brake controller in 2008 ford explore .Have wiring for in car and found factory plug but where do i find the other wires needed in the rear ? vehicle is factory equiped with a flat 4 can anyone help
12/17/08 18:28

Have a 2005 ford f 150 with towing package, my left brake and turn signal on camper quit working...checked harness seems ok. It seems no power coming from tow package connector for left turn and brake light. Checked with multi meter nothing....Please help
01/01/09 19:04

I'm not getting power from my my power supply cord that is factory installed. I bought a trailer kit from an auto supply store. All fuses are good but none of the lights work. What's my sequence of checks and/or changes I need to do. Thanks for any help from anybody.

01/17/09 19:28

I had a uhaul tow light package installed a few months ago..Recently rear running lights do not work but signals and brakes do. Check bulbs all work and tested ok, A few weeks ago my right tail lights were stuck on so I pulled the hitch fuse at the battery, then the rear running lights stopped working? Replaced fuse and they still are not working. checked main fuse for rear lights is ok. not sure what is going on but I think Uhaul light switch has something to do w it.
02/04/09 12:47
Paul Gallardo

I have a 2004 ford f-150 I was changing out a light wire on my horse trailer and went to ground, sorting out my running light on the trail. I still have brakes and blinkers. I have no power to my trailer plug for my running lights. I do have all my function on the truck itself, except back up lights. I checked all the fuses in the fuse box. Is there another place they keep fuses, maybe some place under the hood ECT. I have looked under the hood for an additional fuse location and I cant seem to find one.
02/16/09 17:20

where should I hook up my ground strap and why does my back wiper run no matter whether they are turned on or off?
03/23/09 17:04
bob lostracco

I have a 2001 explorer sport.Both turn signals work on the vehicle..both trailer lights work fine tested on another vehicle ..but when I plug the trailer into the vehicle's 4 flat plug , trailer right side turn signal no work.


05/22/09 00:52

I have a F-150 and recently got a boat and trailer. I put some new lights on the trailer and when i plugged everything in the running lights worked and i got the blinkers to work but when i applied the brakes the lights went out except when i had a blinker on. I bought a new wiring harness for the trailer and hooked up everything to the correct wires and now the running lights still work but when i turn on either blinker both blinker lights go off at the same time, also the lights still go off when i apply the brakes.

Anyone have any idea what i might be doing wrong?

07/13/09 14:10
James Alber

I have a 1999 Ford Explorer Sport. The vehicle was hit in the rear a few years ago (minimal damage), and was taken to a local dealership where the rear bumper was replaced. When they replaced the bumper, however, they removed the 4-wire trailer plug and part of the harness. My father in law rewired the vehicle for a trailer. The tail lights and turn signal lights work, but when you press the brakes, the tail lights go out and the brake lights do not work. I have checked the wiring to the trailer and everything seems fine. I did notice on the Explorer that there are 4 wires, yellow, green, brown and black. All of the wires on the trailer plug correspond to the wires on the truck except that the black wire on the truck is connected to the white wire, or ground wire on the trailer plug. Is this black wire supposed to be a ground or is it a separate wire for the brakes?


11/12/09 17:21

I'm having the same problem sort of. I need to know what the 4 wires function are coming off the trailer connection of my 02 Explorer.
02/14/10 22:14
Joey Expedition

Hi I have a 03 expedition and im having a problem with my trailer lights I plug my trailer lights wire in while my truck was running and it spark and turned all my trailer lights off i changed a few fuses and turn signals and brake lights work but running lights wont work does anyone know what i can do to locate that fuse or issue pleeeassssssse help thanks
03/21/10 20:08

Helping a friend with his 97 Ford Explorer. The trailer lights quit working, but the license plate lamp in the same harness still has power. No power to the other wires in the harness at the left bumper junction. Fuses are OK. Is there some link between the under hood fuse and the connector by the rear window washer that is prone to failure?
08/08/10 14:53

I have a 1995 Ford Ranger XLT. I have voltage to every wire coming off the pigtail connections but the left blinker and left brake light do not light. The issue has to be with my truck as my cousin's Chevy works perfect with the same trailer.

I have voltage coming off the four sides flat connectors and my meter bobs back and forth when the left turn signal is used on the truck.

I changed Hoppy Tail light Converter and it made no difference.

Any suggestions?

10/30/10 13:33

My 2004 ford escape two back brake ligts dont work. The top tail back up light works. Changed out the mulitunit switch, bulbs are ok, fuses are ok .... cant figure out the problem pls help>
04/14/11 11:14

I have a 2004 ford ranger edge I use a 4 flat basic wiring package. I can't get my running lights to work, the signals and brake lights work and so do flasher but no running lights. I tried replacing the fuses and checking the ground but it hasn't solved the problem.
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    Archived Replies

    This post has a total of 25 replies. The most recent 25 were shown above, you can view the complete archive here: 2004 Ford Explorer Trailer Wiring Troubleshooting archive. Your feedback, comments, opinions and questions are welcome and encouraged.

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