Question about 1998 Ford Explorer

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Bought trailer harness for my trailer all four poles show 4 wires mine has five wires going to trailer lights turn on signals both light up like four ways also no brake lights. made sure all lights were grounded

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Try http://www.etrailer.com/faq-wiring.aspx. This should help. The 5th wire is a lockout for the brakes that hooks to your back up lights. So when you back up, the brakes won't engauge. Typically white is ground, yellow is left turn, green is right turn, and brown is running lights.

Posted on Oct 01, 2009

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I need to find the correct wires to join from the loom to the trailer the diagram i have does not match the colours for instance there is no yellow how do i match the right ones up to the trailer


Use a voltmeter and see which wires in the loom show power when (1) tail lights are on, (2) brake lights are on, (3) each turn signal is on, and (4) which shows continuity with vehicle ground/earth. Match these up with the appropriate wires in the trailer harness.
If your brake lights and turn signals are the same bulb on the towing vehicle, you're all set. If they are different bulbs, you'll need an adapter to get both brake lights and turn signals to work on the trailer.

Dec 24, 2016 | Cars & Trucks

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04 toyota corrolla I need to wire a harness for a utility trailer, not sure how many wires are needed and do I need 1 or 2 lights on each side of trailer. not sure on these newer cars with more than 4...


First and foremost, installing the wiring harness is not the easiest task, but not the most difficult. Typically you will use a 4 pole harness. One wire goes to tail light on, second wire goes to brake light, then one to left signal and right signal. You will need a test light of some sort in order to determine the hot or live wire for each bulb. Once you confirm the wire you can simply splice the wire off the harness into the factory harness. One thing I will mention at this point is using a typical four pin instead of a adapter that are a it more expensive can cause more draw on your cars electrical system. Although I have never had any problems on my cars. I have heard situations in which wires have become cooked.

As far as trailer lights go it may depend on the state. Here in IL, you can get away with running 1 light on each side of the trailer granted all functions work-brake, running lights and turn signals.

Good luck

May 26, 2011 | Toyota Corolla Cars & Trucks

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I bought a lark enclosed trailer and it is wired with the 7 pole rv plug and my truck has the 6 pole. i changed the trailer end to a 6 pole, matched the same wiring as my other trailers but the lights on...


Normally all trailers are wired the same. What I think has happend is the new plug has been wired in wrong. The Rv Plugs wiring is differnt than that of a flat four and round six. I would look in the box that you got the plug in a make sure the wires are correct. I can't find a diagram work the wiring but I do know that the brown is the tail lights, red is the brake, yellow is left turn, green is right turn, and the blue wire is the electric brakes. there is also a Aux power I think that is a pink or Bigger gauge red wire.

Mar 02, 2011 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

2007 Chevy silverado (classic). Once hooked up to trailer, the brake lights do not work only turn signals on trailer.


firat of all check and make sure you have a real good ground or otherwise you will lose current to another wire and this can short out and cause the lights to malfunction.

White: Ground
Brown: Running
Yellow: LT and Stop
Green: RT and Stop

This is the wiring code for the 4 wire trailers and
Wire a round seven-pin hitch, typically sold without a wiring harness, to the vehicle observing the following color codes: Run a white 10-gauge wire between ground and terminal one, run the blue 12-gauge wire between the electric brake controller and terminal two, the brown 14-gauge wire between the taillights and terminal three, the black 10-gauge wire between the permanently live 12-volt supply and terminal four, the yellow 14-gauge wire between the left turn/brake light and terminal five, the green 14-gauge wire between the right turn/brake light and terminal six and the purple 14-gauge wire between the backup light and terminal seven (in the center).

Feb 18, 2011 | 2007 Chevrolet Silverado Classic SS New...

1 Answer

How to wire a 4 pin connector for a LED Tailgate bar into the brake lines on a 2000 dodge dakota without trailor plug


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 attached 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 | 2001 Dodge Dakota

1 Answer

I wired up a 4 pole trailer wiring harness up and went by instructions. i wired both turn signals up white to ground and tail light to tail light but i have no brake light wire on the harness so my brake...


You need to purchase the trailer wire kit that has a solid state module that will allow the lights operate correctly. It plugs right in the factory socket, no cutting of wires are needed, and it costs around 40 dollars. It is the only way to go for your vehicle.

Sep 18, 2010 | 1997 Jeep Grand Cherokee

2 Answers

Wire harness for trailer


You will need a test light, don't worry about the colors. Four wires, one for left turn signal, one for right turn signal, one for parking lights, and one is ground(usually black). Hook up ground, turn on trucks left signal and hookup to one of trailers other three wires, you will either light up the correct light or wrong one just continue til lights match coming off your truck to what you want to light up. And brake lights are left and right signal, so if you do signals the brake light will work. I can explain further if you need help.

May 23, 2009 | 2000 GMC Jimmy

2 Answers

Have a 2005 chevy colorado, i installed a four way harness exactly how the directions say, but when i connect the trailor only the right and left turn signal and taillights work. No break lights.


On the truck, are the turn signals and the brake lights using the same bulb, if the brake lights are using a different bulb the trailer might not work withe the truck if it only has a 4 wire plug, might have to add brake lights to the trailer and use a 5 wire plug, yes this means rewiring the trailer and adding lights

May 15, 2009 | 2005 Chevrolet Colorado

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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