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Honda trailer wiring harness

Only the night ligts work on the trailer - the tunn signals and the brake lights do not work on the trailer

Posted by Anonymous on

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6ya6ya
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Posted on Jan 02, 2017

pops296
  • 174 Answers

SOURCE: Trailer brakes

Take a 12 volt test light... the kind that has a spring loaded clip to hold the probe into the wire, and insert it into the wire just before the trailer plug, vehicle side. (Blue I think) If there is a connection, the brake should see it and you should have an indicator light. When you activate the brake the test light should lite up. If not, move up to the brake actuator and test the blue wire. If there is nothing at the actuator, check the black wire. It is power to the controller. If no power there, check fuses again. If it does pick it up at the plug, connect the trailer and test the trailer itself. First ground to the trailer and then to the truck. Most problems are ground wire related. Then move to the axle and test it there. For the brakes to work, and even show on the indicator, there has to be a ground and power to the brakes themselves. There are 2 wires to each brake... a ground and a power. Test across both wires to make sure you have power and ground. You can also hook another trailer to your truck or another truck to your trailer. Lights can work through trailer ball ground. Brakes can't. leave the trailer unhooked from the trailer and hook the wiring up and test the lights. That usually will indicate a good or faulty ground. Also make sure there is a GOOD ground to the truck frame/body. Also try http://www.etrailer.com/faq-wiring.aspx. They have a great website with lots of info. Hope this helps. Mike

Posted on Oct 07, 2009

  • 1 Answer

SOURCE: Trailer wiring

you have to purchase a converter box with 5 wires, red, yellow, green and brown. this is because your turn signal is seperate from you parking and brake light bulb. you have to wire it straight in behind the connector.your basically converting two wires ( brakes and parking) to one wire (tailights) 5 wire to 4 wire.

Posted on Feb 04, 2010

  • 1 Answer

SOURCE: durango trailer wiring left turn signal doesn't

I lost all of my trailer lights. Turns out the wires in the harness were corroded out by the gas tank. Dealer said it was a common problem

Posted on Apr 02, 2010

  • 1 Answer

SOURCE: 98 silverado no brake lights

Just a thought but you may want to look at your multifunction lever. The brake lights have a contact in there and it may be bad. Not uncommon so I have been told. I replaced mine but be warned the multifunction lever will set you back almost $200

Posted on Aug 06, 2010

unclebuck282
  • 1 Answer

SOURCE: Wiring harness problem

I have the same problem, left trailer light comes on, stays on until I touch any door handle. It appears that the interior courtacy lights coming on, put the tail light out. There seems to be a relationship between the courtacy lights and the activation of this tail light. I tried a different trailer and had the same problem with either trailer.

Posted on Sep 20, 2012

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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

1 Answer

My o3 navigators adjustable brakes will only move about 1/2 inch either direction. It's fine if they don't work but is there any way to move them to the farthest position manually?


With both tail light lenses removed locate the black with yellow wires and the dark green with brown wires coming out of the brake/tail/turn signal sockets.

The black with yellow wire will be the running lights or tail lights and the brown wire from the trailer harness will attach to it.

The green wire on the trailer harness will be the right turn signal and will be attached to the passenger side tail light harness dark green with brown wire.

The yellow wire on the trailer harness will be the left turn signal and will be attatched to the dark green with brown wire on the drivers side tail light harness.

The white wire on the trailer harness is the ground wire and will need to be attached to a good ground. Is it pretty easy to crimp an eyelet onto the end of the wire and use a self tapping screw to attach it to the body behind one of the tail light lenses.

Here is a trailer light/wiring article I have done in the past. It has a couple of good tips you may find useful.

http://www.hotspotoutdoors.com/forum/ubbthreads.php/topics/1425999/1/Trailer_Wiring_101

Oct 27, 2010 | 2003 Lincoln Navigator

3 Answers

Trailer lights have two wire out of each fixture left turn goes on left side Right hand turn goes on the other side Tail lights connect how and brakes connect how?


One wire is for the brake/directional filament and the other wire is for the tail light. The fixture should be grounded when it is attached to the bracket. To test which is which (the brown wire is USUALLY the ail light) make sure the fixture is grounded and touch a hot wire to each of the wires coming from the fixture. Watch to see which wire lights up the brighter filament and this is the brake/directional light. The dimmer filament if the tail light. Brakes lights and directional lights are both the same filament. Wen the brakes are applied, both lights are activated. When a direction light is turned on, it simply flashes the brake light filament.

Apr 04, 2010 | 2007 GMC Sierra 3500HD

3 Answers

Which fuse controls trailer brake lights ,left side works right doesn't


seperate fuse box under hood some time, alldatta is in your library

Feb 17, 2010 | 2006 Dodge Ram 3500 Truck

1 Answer

1999 Honda Accord LX sedan trailer harness install help


The Running Lights are BROWN, the RIGHT Turn is GREEN, the LEFT Turn is YELLOW and White is GROUND.

Nov 11, 2009 | 1999 Honda Accord

2 Answers

Brake lights don't work, all other lights do


THE PROBLEM IS IN THE MULTIFUNCTION SWITCH, REPLACE IT.

Jul 09, 2009 | 1996 Chevrolet K1500

2 Answers

Pressing brake causing blinker issue


The trailer harness that was installed probably has a short inside the box that distributes power to the trailer pig-tail. Remove the trailer harness. You problem will be cured.

Jan 27, 2009 | 1999 Toyota 4Runner

1 Answer

2001 Sportage Trailer wire connections


brown to the tail lights. yellow to left turn signal. green to right turn signal. this is a basic 3 wire hook-up i use all the time w/4wire connectors for all trailers. white wire is not used. ground is established when you hook to the ball.
to find the correct wire to splice to, use a testor (has a clip to the bare wire, and a sharp point to the truck frame). using a needle, push it through a wire to rear light harness. turn on the turn signal. check if the connection is the blinker, testing until you have the blinker wire. the tail lights can be attached to the license plate wire. brakes and blinkers use same wire, so brake lights will work whenever the turn signal is attached.
to be sure everything is working right, have a second person go inside the truck and work the signals, brakes and lights one at a time while you are at the back of the trailer telling what to do.

Oct 24, 2008 | 2001 Kia Sportage

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