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Trailer lights don't work, there's something special that I need to do, Its wired right?

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Fix Trailer Lights Instructions Diagrams

Posted on Dec 14, 2016

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

motor1258
  • 6674 Answers

SOURCE: LEFT TRAILER TURN SIGNAL DOES NOT WORK

I'd get a 12vdc test light if you don't have one already & start from plug, and keep probing back from there. It may be as simple as a bad connection under truck where joined into harness.

Posted on Nov 29, 2008

csmock132
  • 4669 Answers

SOURCE: trailer light problem

Check it with a test light. White-ground, Yellow-left turn, Green-right turn, Brown-tailights. Check it on the truck first. There are seperate fuses for just the trailer wiring in the fuse box under the hood. The Blue and Red wires are for Trailer brakes, don't worry about those.

Posted on Mar 14, 2009

  • 48 Answers

SOURCE: pass. side trailer turn and brake lights out 1999 ford explorer

if your vehicle lights are working all the fuses will be good. follow the cable from the towing socket on your vehicle , it will most likely go behind one of the rear lights to connect into your cars system,
check your tester where the cables join and you should find the problem. hope this helps.

Posted on Apr 23, 2009

240SXer
  • 100 Answers

SOURCE: need diagram as to how to wire trailer lights

Go here:
http://www.accessconnect.com/trailer_wiring_diagram.htm

Posted on Aug 14, 2009

pops296
  • 174 Answers

SOURCE: LEFT TRAILER TURN SIGNAL DOES NOT WORK

I have seen once before that the fuse box was bad on a 2003 Dodge 3500. I had power in and nothing out. We had to replace the box. Not cheap! Hope it is simple like a loose connection though. I think I had to pull the inner fender on the drivers side to access the bottom of the fuse box. Pain in the ****, but...

Posted on Oct 01, 2009

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1 Answer

I just bought a horse trailer and when I hook it up to my 2006 Silverado, the lights don't work. My trailer hitch and wiring system are new, and the previous trailer owner tested the lighting of


Some people wire trailer plugs differently. If the plug is not wired differently than yours, make sure the tow ball is clean. No rust. That's where the trailer gets its ground from. Usually they will work if thats the case, but not right. I can't remember what the wire colors are right now. Go to etrailer and look up the diagram.

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I dont know how to wire lights to trailer from 1986 toyota pickup


You need a "test light". Then you turn on the circuit you want to wire in, tail lights, brake lights, blinkers and poke around the back of your light sockets until the test light comes on. Then you splicew into that wire and run it to your plug in. If you don't know which wire is what on the trailer, hook it up and with the wire fastened into the truck harness, try it on the trailer harness wires until you get the proper lights working. Process of elimination. Hope this helps.

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1 Answer

Back up wire intrailer connector has no power back up lights work


Did you make sure you have a good ground? I had to install an additional ground wire from my trailer frame to my truck frame to make sure that I have constant ground so that things don't stop working.

But you should also check and make sure that you have the right wiring to operate back up lights in a trailer. Normally the flat four wire type connectors are not designed for a trailer with back up lights.

Jun 30, 2011 | 2004 Dodge Ram 1500

1 Answer

I have a 1997 Aerostar and would like to wire for trailer lights. I opened the panel on the left side just in front of the tail lights and found a couple wiring receptacles. Are these for trailer...


if they have color coded wires that are brown,green,yellow and black then its possible.but i don`t think so.you can buy a trailer wire adapter that just plugs into the car factory wiring so you don`t have to splice(solder) the wires into the car wiring and it will show you the area for the connection and picture.if you don`t want to go that route then the tail light wires colors are brown.the left signal color is yellow and the right is green and the ground wire on the car is black but on the trailer wire harness it is white.

Apr 12, 2011 | Ford Aerostar Cars & Trucks

1 Answer

Now power to the trailor hook up on back bumper, fuses are O.k. wiring apears to be o.k. it is dodge ram 1500 4x 4 single cab c/w 4.7 8cly. be nice to get a wiring diagram. thanks Wayne


you will need to check the wiring under the bumper where the trailer wiring is with a test light and with the different lights working.you will probably have to move back in the wiring by 6" and retest until you find were the loss of power is.you don`t say if all the lights don`t work or just certain ones.the brown wire is the tail light,green is the right signal light,yellow is the left signal light and white is the ground wire.you could have broken wires at the trailer hook up itself.

Mar 22, 2011 | Dodge Ram 1500 Cars & Trucks

1 Answer

I connected da trailer n I have light n left n right turn signal but no brake light


Chances are the trailers bulbs need to be replaced. The truck uses the same wire for turn and brake signals. If they work on the truck, That means there is something wrong with the trailer.
I wrote a great article about diagnosing trailer problems. Click here to read.

Dec 28, 2010 | 2000 Chevrolet Silverado 1500

2 Answers

SemiTrailer Wiring when I turn on my left turn signal all lights blink.


sounds like if its a 2 filiment bulb(1156) one of the filiments is touching the other and back feeding the signal,start by removing all signal bulbs and replace each with a new one as a test,also reground all grounds,if the signal cant find reference ground it will take the next path to find it,if this doesnt work then possibly you have wires in the frame bare and touching

Mar 18, 2010 | 2004 Dodge Ram 1500

2 Answers

2005 ford f-350 trailer brake lights and turn signals not working. need to know if they splice in, plug in, on thier own fuse and where?


They are spliced in. Your problem sounds like a bad earth to your trailer. Check you have a good earth as its a very common problem with trailer light's when a few lights are out.

Sep 06, 2009 | 2005 Ford F 350 Super Duty

1 Answer

Trailer light problem


Check it with a test light. White-ground, Yellow-left turn, Green-right turn, Brown-tailights. Check it on the truck first. There are seperate fuses for just the trailer wiring in the fuse box under the hood. The Blue and Red wires are for Trailer brakes, don't worry about those.

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DODGE 2006 R3500 7 WAY/4 WAY TRAILER PLUG


I also have the same problem with my 2006 ram 3500. I am looking for someone who can provide wiring schematic for this truck. I also believe mine to be intermitant.
Thank you

Aug 20, 2008 | 2001 Dodge Ram 3500 Truck

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