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7 pin to 5pin wiring

For trailer

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I find that the easiest way to fix this is to by a connector that is already wired for this situation. They are available from good auto spares shops. IT saves having to rewire the plug every time you use a different trailer set up.

Posted on Nov 22, 2013

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1 Answer

My truck has a 4 wire plug plugging into a 4 plug with 5 wires to trailer. how do you wire trailer wires to adapt to plug that plugs into the plug with 4 wires


If the trailer has electric brakes that are powered by a separate battery, you use a 4-pole to 5-pole adapter and connect the extra wire to the truck backup light circuit.
4 pin to 5 pin plug for trailer lights The Hull Truth Boating and Fishing...

Aug 12, 2017 | Cars & Trucks

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

My trailer brake lights on my 2001 suburban 2500 work when the truck is not running but when the truck is running they will not work. All other trailer lights work including the blinkers which is the same...


suggest downloading the trailer pin standard for whatever number of pins your trailer plug has and tracing the wiring from the colors . The standard will tell you what color goes to what light and what pin number it should be on . Also 5 pin and 7 pin are different . You can plug a 5 pin into a 7 pin but the wiring is different .

Also check the trailer socket is grounded at the car body properly. As this can cause lots of weird symptoms.

Apr 29, 2017 | 2002 Chevrolet Suburban 2500

2 Answers

I need a wiring diagram for a 7 wire system


I am guessing you mean the 7 pin trailer tow adapter.

the 7 pin RV plug itself

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The 2005 trailer tow adapter wire diagrams
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Oct 23, 2010 | 2004 Ford F150

1 Answer

Were do you hook up the two wires under the hood for trailer brakes on a 2000 silverado


Sometime around 2000, GM started putting trailering pre-wire harnesses in the vehicle. Your truck may have this harness built in and would greatly simplify brake controller installation. Look under the glovebox and see if there is a wire harness tied off. There will be four wires in this harness, which should be run over to the steering column to use it. Most trailer brake controllers are compatible with this harness.
The four wires in the harness are: Red, 12vdc; black, ground; blue or purple, brake pedal; and brown or white, trailer brake wire to seven pin, four pin, or five pin connector at trailer hitch, if your truck came from the factory with a trailer hitch.
If you are adding the hitch and do not have the four wire harness, the under hood wires from your brake controller are Red, connect to one of the studs under the distribution box cover (the distribution box is on the driver's side against the firewall. Underneath the cover are two large threaded studs which are hot from the battery all the time); and the other wire from your brake controller would have to be run the length of the truck along the frame, tied off in several places, to the trailer hitch connector on the bumper. Follow the directions that came with trailer hitch wiring connector to connect this wire to the proper pin in the connector.
If this has helped you, great, and please remember to vote/comment.
Good luck!

Feb 21, 2010 | 2000 Chevrolet Silverado 1500

1 Answer

Electrical towing wiring problem on Grand Caravan 2006


Well the BEST way to fix that is take the Van AND Trailer to the dealer and make them check it over and get it working. Sounds like they screwed up., and are trying to blame the trailer. The 4 pins are easy to check Running lights, Left turn, Right turn and Ground. I suspect the 7 pin is wired wrong. I dont know why they put a 7 pin wiring plug on? Those are used for largeer trailers that need a battery feed and electric brakes

Dec 16, 2009 | 2006 Dodge Grand Caravan

1 Answer

I have a unimount plow. My headlights on the plow will not come on with headlight switch


hi 1st check if light working 2u can not run all lights at same time; ok u need a rely4 pin or 5pin rely 85 86 pins to energize the rely pins 30 87 is used to energize the lights 87a is not used center pin; 3need tagl switch that have light ;find right wire for parking lights hookup 85to that wire 86 go to Negev 87 go to a15 amp fuse that gets power from B+ .30 go to plw lit now u can run low beam+plw or H beam+plw now u can run safly evriting

Dec 08, 2009 | 2000 Chevrolet 2500

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

3 Answers

Wiring for a trailer


u must install the fuses for the system in he underhood heavy duty fuse box, it will be marked trailer tow

Mar 17, 2009 | 2006 Ford Escape

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