Question about 2003 Ford Expedition

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Wiring problem for the towing problem

All of the lights on the truck work. when hook up the trailer all of the lights work but when i turn on the left turn signal it wont work. I have tried this on 3 trailers and it does the same thing

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Hi, I think your problem is with your wiring in your truck.
check out this diagram http://www.accessconnect.com/trailer_wiring_diagram.htm

Posted on Feb 11, 2009

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Check the fuses I think there is a seperate fuse for the trailer harness

Posted on Aug 26, 2008

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Only left trailer blinker and brake light work when I hook up my trailer. Just got this 2006 Nissan Titan and everything worked on my trailer before. There was no TRAILER TURN RH relay installed in the...


If the blinker is working on the truck then fuse is good, this sounds like a bad bulb or connection to the light, the brake and signal use the same filement in the bulb. check the bulb first, next thing to determine if its the trailer wiring or the truck socket, use a testlight and test the connector or the wire at the trailer connector and see if there power in the wire, but check close to connector if theres power coming out the connector then it in the trailer wiring or bulb,. also im not sure what this trailer turn relay rh is that you speak off. the only thing i could think of is to converter the signal and brake on the truck to operate the same bulb on the trailer, if this is what you installed then check that wiring also as the controls the lights to the trailer, but if this truck was built with the tow package then it should of be wiring already for this. here a good site to help you with the wiring as this gets hard to explain over the computer, but again test the tow connector on the truck first with a testlight, this way you will be able to see if it the trailer wiring or the truck wiring to connector. google trailerlightwiring. good day. let me know if you have any other questions.

Sep 05, 2011 | 2006 Nissan Titan

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The plug got torn off the the back and i do not no what or were to hook up the break lights nor do i no how to add a plug for a trailer can you please help me out


  • Hi, not sure which one you have so I will list both for you.
ironfist109_59.gif

  1. Ground - Black
  2. Blk/Orange - Park lamp relay output
  3. Yellow/Pink - Trailer tow right relay output.
  4. White/Pink Trailer tow right turn relay output.


ironfist109_60.gif

  1. Nothing.
  2. White/Pink - Trailer tow right turn relay output.
  3. Violet/ Black - Back up lamp feed.
  4. White/Red - Fused (B+)
  5. Black/Orange - Park lamp relay output.
  6. Nothing.
  7. Black - Trailer tow brake (B+)
  8. Black - Ground.
  9. Black - Ground.
  10. Yellow/Pink Trailer tow left turn relay output.

  • Hope this helps and thank you for using FixYa.

Regards, Tony

Aug 12, 2011 | 1999 Dodge Ram

1 Answer

Instructions for wiring a moving trailer connector


accessconnect_logo.jpg


Trailer Wiring Diagrams 4 Way Systems

4 way flat molded connectors allow basic hookup for three lighting functions; right turn signal / stop light (green), left turn signal / stop light (yellow), taillight / license / side marker (brown) and a ground (white).

4%20way%20wiring.jpg 4way_vehicle.jpg 4 way tow vehicle side.
4way_trailer.jpg 4 way trailer side.
5 Way Systems

Same as 4 way system listed above but adds a extra blue wire for brake signal or auxiliary power. Used on pop up camper trailers or utility / boat trailers.
5way_vehicle.jpg 5 way tow vehicle side.
5way_trailer.jpg 5 way trailer side.
6 Way System, Rectangle Plug 3/4 inch by 1 inch 6 way rectangle connectors right turn signal (green), left turn signal (yellow), taillight (brown), ground (white). The red and blue wire can be used for brake control or auxiliary. Use on a small motorcycle trailer, snowmobile trailer or utility trailer. Can also be used as custom wiring on trailers with 3 light/wire systems. See "Tow Vehicle Taillight Wiring" below.
6way_rectangle_1.jpg 6 way tow vehicle side.
6way_rectangle_2.jpg 6 way trailer side.
6 Way Systems, Round Plug

Round 1 1/4" diameter metal connector allows 1 or 2 additional wiring and lighting functions such as back up lights, auxiliary 12v power or electric brakes. Note: The black (sometimes red) 12v and blue electric brakes wire may need to be reversed to suit the trailer. Check with a test light or VOM. Uses: horse trailer, travel trailers, landscaping trailer, car trailer, etc.


6way_vehicle.jpg 6 way tow vehicle side.
6way_trailer.jpg 6 way trailer side.
7 Way Systems

Round 2" diameter connector allows additional pin for auxiliary 12 volt power or backup lights. Uses: heavy duty landscaping trailer, car trailer, boat trailers, horse trailer, travel trailer, construction trailer, etc. Check with a test light or VOM.


7way_vehicle.jpg 7 way RV flat blade tow vehicle side.
7way_trailer.jpg 7 way RV flat blade trailer side.

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Need wirering diagram to hook up trailer lights and elecric break


Also try http://www.etrailer.com/faq-wiring.aspx. They have a great website with lots of info. With the tow package, there should be a plug under the dash... far left above the emerg. brake petal. The harness that plugs into it should have came with the truck, or you can order one to fit it. Did thew truck come with a 7 pin plug on the back? If not you can order one from the above mentioned site. They also have the wiring colors.

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moz-screenshot-1.jpg 08-33-93f1.gif CAV CIRCUIT FUNCTION 1 Z13 12BK GROUND 2 B40 12LB TRAILER ELECTRIC BRAKE OUTPUT 3 L76 12BK/OR TAIL LIGHT (Trailer Tow Relay in PDC) 4 A6 12RD/TN* FUSED B(+) (40A, Always Hot, F8 in PDC) 5 L63 16DG/RD LEFT REAR TURN SIGNAL TRAILER TOW 6 L62 16BR/PK RIGHT REAR TURN SIGNAL CONNECTOR 7 L1 16VT/BK BACK-UP LAMP FIGURE 1: 7-Terminal Trailer Tow Connector

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09 Silverado LS no trailer clearance lights


Then the problem is either with your trailer plug in, or the plug in on the truck. Use a test light to figure out which it is.

Jun 05, 2009 | 2008 Chevrolet Silverado 1500 2WD

2 Answers

I only have taillights coming out of the trailer plug


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Tow plug


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Nov 25, 2008 | 1998 Ford F150 Regular Cab

1 Answer

Left turn signal on trailer


ok tdknutson, I'm not clear on this, does the truck left turn signal stop working when u plug the trailer in, or is it the trailer left turn signal that's not working, or both? When u plugged in the test light did it show u had power to that plug in? Let me know the answer to the above, and in the meantime, check the ground on the turn signal at the trailer. Make sure it's not loose, and tightly connected to the frame (or wire). Also, what type plug in do u have? 4, 6, 7 wire?

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