Question about 2005 Ford F 250 Super Duty

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Tow plug We have a travel trailer that when the trailers plugged into the truck the left turn and brake light don't work. All other lights work and it comes on when head lights are on. We can't figure it out. we have gone over every part of the wiring of the tow plug. Could it be the camper plug? I don't know. We also had to install a brake controller in the truck. F-250 it has 4 colored wires and the brake controller has the same colored wired. It said to hookem up to the same and it would work... Well it doesn't. Any help you can give me would be great. Thanks Eric in PA

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  • yadayada
    yadayada May 11, 2010

    ask your question once please.

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  • 11 Answers

Check and clean all the ground connections.It sounds like a ground issue if they come on with the headlight switch.

Posted on Aug 17, 2009

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1 Answer

When I tow with my car the left blinker doesn't work on the trailer. There is a 7 pin round plug on the car, with a flat adapter to the flat pin on the trailer. I have had the same problem with at...


Hello Carol, The 7 way is for use with a brake controller and/or a trailer that has electric brakes. The 4 way flat is a basic trailer plug connector.
Connect as follows:
Green wire- Connects to the vehicles right turn wire harness & provides brake light and right turn signal on trailer.

Yellow wire- Connects to vehicles left turn wire & powers brake light & Left turn signal on trailer

White wire- Ground

Brown Wire- Tail/ marker/ license plate lights

The Blue, Red & Purple wires on the 7 way will not be used on the adapter, those are for brakes.

I hope this information is helpful.

mr_brokrench_4.jpg

Sep 18, 2011 | Honda Accord Cars & Trucks

2 Answers

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.
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  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.


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  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.

Jan 01, 2011 | 2001 Pontiac Montana

1 Answer

Trailer wiring problem. Tow vehicle is a 2008 Grand Caravan with 4 wire plug. Double checked, plug function works fine. When trailer is plugged to tow vehicle with tow vehicle lights OFF the trailer...


Most likely the brown wire from the trailer connector is connected to a constant battery voltage source, and it should be connected to the vehicle running light circuit, however someone might have wired the trailer connector up that way on purpose so that the trailer does not draw power from the vehicle running lights and possibly damage the vehicle running light circuit. (Dodge/Chrysler vehicles do have delicate lighting systems) Here are some images to help assist you, and the 4 way connector is the same as the 5 way connector just without the blue wire for the trailer brakes.


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Jul 06, 2010 | 2008 Dodge Grand Caravan

7 Answers

2003 Dodge Ram 3500 left turn signal problems / trailer


Well let me shed some light on this issue. I have the same problem. Trailer connection from truck does not have power to left turn signal and left brake light. I just got back from the dealership and $100.00 labor charge. My problem is the TIPM (Fuse Box for short) and FCM (little silver module hooked to the Fuse Box on the left hand side of the fuse box). $910.00 for the parts and Chrysler doesn't have any in stock. 4-6 weeks to maybe fill a back order. I am currently researching an alternative way to fix this issue. I will let you know.

Feb 04, 2010 | 2004 Dodge Ram 2500

1 Answer

I have a horse trailer and all of the lights works except the left turn signal. There is power at the appropriate blade(7way) on the tow vehicle (female) side but when I plug the trailer in and pull the...


Check the lug on the truck to be sure it doesn't move when the plug is connected. I had one that read 12 volts when I tested it but would slide in or move when I plugged into it. I replaced the plug on the truck and it solved that problem. Trailer wiring typical is yellow to the left turn/brake light. Does the left brake light work? Do the flashers work? Double check the fuses also... to left turn/brake on trailer. Hope this helps. Mike

Sep 22, 2009 | 2003 Ford F250 Super Duty Crew Cab

2 Answers

I only have taillights coming out of the trailer plug


so, the trailer has no brake lights, or turn signals, just tail lights? Everything (all lights) on truck work ok? What do you have for trailer wiring hook up 4, 5, 6, or 7 way? There is no fuse, the lights all work off the tow vehicle lights, so if the tow vehicle lights all work properly, it's probably a wiring problem, such as bad grounds, loose connections, etc. Get a volt meter and check voltage at truck plug to see if power is getting that far. If truck plug in is ok, wiring problem is the trailer. Make sure all grounds are tight and rust free, that's a common problem.

May 20, 2009 | 2004 Chevrolet Silverado

1 Answer

Tow plug


I take it the blinkers and brake lights work ok when not hooked up to the trailer? If yes, then the wiring to the tow hitch is not hooked up correctly. How many wires to trailer pig tail connection? U can have up to 7 depending on what you tow. Check to make sure these wires are hooked up from the truck to tow plug correctly: 7 wired---
brown-Rt turn and brake light, yellow-backup, white-ground, blue-electric brake, green-tail running lights, black-battery charger, red-left turn signal and brake light. Let me know if u have something other than 7 wire, I'll get the wiring color and source info for u.



Nov 25, 2008 | 1998 Ford F150 Regular Cab

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