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4 wire trailer wiring - Envoy GMC Cars & Trucks

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

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Posted on Jan 02, 2017

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Anonymous

  • 44 Answers

SOURCE: trailer wiring a dodge magnum

Get a trailer harness from the dealer, they just plug into the vehicles harness.

Posted on May 30, 2008

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Anonymous

  • 160 Answers

SOURCE: 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.

Posted on Dec 07, 2008

CRTN

Michael Fisher

  • 716 Answers

SOURCE: trailer lights 98 explorer

They Sell Trailer Wiring Kits At Autozone And Probably Any Local Autoparts Store.

Posted on Jan 22, 2009

pops296

Mike Tillman

  • 174 Answers

SOURCE: 2001 caravan trailer wiring

Check with http://www.etrailer.com/faq-wiring.aspx. Sounds like a faulty converter.

Posted on Feb 03, 2010

jimmy

  • 409 Answers

SOURCE: trailer wiring

Have you checked the fuse box under the hood? There are seperate fuses for the truck lights and the trailer lights. If the fuses look good use a 12 volt test light to check for power on the turn signal pins when the brake is pushed. The brake lights and turn signals use the same wires to work. Power here would indicate the wiring and fuses on the truck is all good, meaning the trouble is on the trailer. Check the bulbs to be sure they are the correct ones, they should be dual element bulbs. Make sure you have a good ground on the trailer, usually the white wire in the 4 way plug is grounded to the trailer frame, do not depend on the trailer ball to be the ground, this is asking for trouble.

Posted on Apr 07, 2010

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1 Answer

Trailer wiring


Trailer wiring uses the fuses for the car lights. Turn signal, running ans brake lights. Some plugs also charge the trailer battery if so wired. Check the ground wire for a good body connection. This wire often gets overlooked and can stop all trailer lights if it fails.

May 24, 2014 | 2008 GMC Envoy

1 Answer

Wiring diagram


Hook up the trailer to the vehicle. Under the rear bumper you will find a thick wire harness that runs from left to right or vica versa. Choose a location to strip open the harness to gain access to the different color wires. Open the trailer coupling. remove all wires and split them apart. Now start with say the right indicator light on the vehicle. Earth should be established via the grounding method of the trailer hook steel on steel of the vehicle. Connect any wire of the trailer to the now flashing right indicator light. Go through them all till the right indicator bulb flashes on the trailer. A good approach to determine which wire is active, is to make a test light from an old bulb connector some have already two wires connected ie; pos neg. neg the tester onto any part of the vehicle chassis and the pos to the now live wire. Go through them all till all wires meet up. Now go on and extend the harness by means of soldering properly and insulating that wire from the main harness to the female fitting of the trailer connector. At each connection on the fitting fit on properly the different wires and do the same to the male connector from the trailer so that all lines up inside the two connectors. Good luck

Aug 14, 2013 | 1993 Land Rover Defender

1 Answer

Trailer - brake lights don't work on one trailer - work fine on other....


You have to many bulbs running for the size wire you can get into a 7 pin plug. You will have to up grade to a heavy vehicle plug which is around 2" in dia.. Next the stop light draw 25 watts each so if you have 3 trailers that ia 6 x25 watts x12 volts will indicate how many amps you are pulling when the brakes come on. Next you can change the wiring so that each bulb is connected in parallel not series that is the first 2 lights have one wire the 2nd bulbs will have a different wire out of the same pin and so on for the rest of the trailers. So what you will have will be say for 3 trailers the trailer plug will have wire to the first trailer and out of the same pin will be another wire that will go to the socket for the second trailer and so on That way the wire carrying the load will be the vehicle wire that you should have relayed any way. So you have a big current wire to the relay that is connected to the power pin of the socket. The relay is activated by the stop light wire to earth. This closes the relay and the heavy wire conducts current directly to the stop light pin of the first trailer and is piggy backed to the second socket and so on.. IN the end you will have only 2 bulbs working on each wire and not a multiple of bulbs drawing current on the one wire

Jul 28, 2013 | Ford F-250 Cars & Trucks

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

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

2 Answers

Trailer wiring 2008 Trailblazer SS


Sounds like the vehicle came with towing package. There should be 2 large wires and a smaller one. The blue "should" be trailer brake feed. The other large wire, usually the black, would be 12 volt power for trailer interior lights and battery charge. The red should be a smaller wire and it is the back up light wiring to the trailer. Most trailers don't use this wire, except for brake lock out on some boat trailers with hydraulic brakes. Also see http://www.etrailer.com/faq-wiring.aspx. All of this is used for5, 7, or 6 pin plugs.

Feb 04, 2010 | 2008 Chevrolet Trailblazer

1 Answer

Car to trailer wiring problem


most likely the trailer wires dont match the truck wires. you will need to verify that the truck is wired correctly and then that the trailer is wired to match your truck. problems usually arise after someone has BORROWED a tralier and made the trailer wires match THEIR truck trailer wiring here is standardized but people wire them up any way the can, and it causes problems when that trailer is borrowed or sold.

Oct 03, 2009 | Toyota Land Cruiser Cars & Trucks

2 Answers

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

Sep 30, 2009 | 2003 Chevrolet Silverado 2500HD

2 Answers

I have a problem with my trailer wiring for my 98


Hi There,

There are so many plug /trailer type combos that I finally made a list and posted them as a tip.

Click here for the Trailer Wiring Cheat Sheet.

Hope you find this very helpful

Mike

Sep 23, 2009 | 1998 Ford Expedition

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