Question about 1996 Ford F250 Crew Cab

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Back up lights work on truck but not on trailer. no power getting to 7 way plug on truck.where do i need to look other then the connections for the 7 way plug

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TAKE YOUR TRUCK TO CAP IT OR ANY TRUCK OUTFITTER ,IM SURE ITS A SIMPLE FIX FOR THE EXPERTS

Posted on May 13, 2010

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Posted on Jan 02, 2017

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2 Answers

I installed a new 7 wire connector on my wells cargo trailer, but when I connect the wires as per the color code the lights do react properly. Left signal works well, right signal flashes both tail lights...


Hi Bruce,

Let's back up for a second. Are you wired like this?

http://www.countrytrailer.com/uploads/7wayplug.pdf


Using an inexpensive 12 V test light / tester like the one below, connect the clip to a good ground on the vehicle. Then with someone else working

25604961-wv5jy1ucvwykhgrvtakln1sz-3-0.jpg

the brakes, turn signals, lights, etc. ONE AT A TIME, you should push the point end of the tester into the corresponding connection on the VEHICLE. Only one connection should have power at any given time. Once you have verified that the correct & only connection has power at the right time - you can move to the trailer end of the wiring. If you can not verify the vehicle plug is working correctly - you'll have to get it working right before continuing. These connectors can develop problems over time and may need servicing.

If the trailer still has issues, check ground by uncoupling the trailer hitch from the ball on the vehicle. Keep the 7 pin connector from the trailer plugged into the vehicle and turn on the vehicle lights / have an assistant step on the brake. Connect the clip to the frame of the trailer and push the point to a good ground location on the vehicle. If the tester lights up - you have a bad ground wire between the vehicle wiring to the jack and the trailer frame somewhere. The lighting is relying on the contact between the ball & hitch for ground and could be causing the problem.

Check all the bulbs to make sure that they are the right ones and if the offset bayonet base type - inserted properly. Inspect lamp sockets, wiring and ground leads at each lamp socket. You can also disconnect a wire from a point that is common to left and right sides of the trailer to help narrow down where to look on the trailer for the trouble. If you disconnect a wire going to the left side and everything on the right works as expected when trying all the lights, brakes, etc. then you know the problem is probably on the left side. Reconnect the left side and disconnect the right side and test again. It is a process of elimination when you can't see anything obvious. Keep disconnecting 1/2 of the side that is causing trouble until you find the problem.

You can purchase a 7 wire vehicle jack test plug like this to quickly diagnose the vehicle for less than $10. It will indicate on the LEDs the power seen from the vehicle.

25604961-wv5jy1ucvwykhgrvtakln1sz-3-2.jpg

Mar 24, 2015 | Cars & Trucks

1 Answer

2006 Ford Expedition left trailer brake/turn light not working.


if there is a power problem then the corresponding lights of the vehicle will out as well. If they work check where the harness is plugged in and check the connection.

Mar 02, 2015 | Ford Cars & Trucks

1 Answer

I need a fuse diagram for a 2006 Ford F250 2WD. My lights all work great on the PU but when I connect the trailer the lights work but no brake lights or turn signals.


If all the lights work properly with the trailer wiring not connected then the truck itself is fine. If attaching the trailer wiring causes the lights to permanently stop working on the truck then you are blowing a fuse and it will need to be replaced. Your owners manual will show you where the fuse panel is. You should be able to check the wiring plug at the back of the truck to be sure it is working properly with a test light and a helper. If the power for signals/brakes etc are not all working at the plug, then trace back and fix these. If all is good at the truck's plug, then the trailer wiring must be faulty. Again, go through it and fix anything that is broken or corroded. Of course it goes without saying, make sure all the bulbs are good.

Nov 02, 2014 | Cars & Trucks

2 Answers

Lost all elec.power to trailer plug on jeep


The trailer connection is usually fed off the wiring from the brake and tail lights If those work, my guess is the wire that goes to ground is open. try following the harness back toward the tail and brake lights looking for broken or corroded connections. If you have a meter or 12v test light try connecting the one end to a good ground if using a meter it should be the black or negative lead. Turn on the running lights and one turn signal while probing the plug if you get voltage or the light to light you have an open ground. Locate and repair the connection.

Aug 07, 2014 | 2010 Jeep Liberty

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

Have issues with trailer lights. Both turn signals on trailer flash when I use left or right turn signal. Have 7 pin factory plug. Lights on trailer work fine, hooked up to 97 Silverado. Act funny on 2000...


Standard wiring colors are as follows:

4-Way

5-Way

6-Way

7-Way

Green

Yellow

Brown

White

Red

Blue

Purple

Right Turn & Brake

Left Turn & Brake

Tail Lights

Ground

Backup Lights

Electric Brakes

Auxiliary Power
Green- Right Turn and Brake
Yellow- Left Turn and Brake
Brown- Tail Lights
White- Ground
Red- Reverse (Back Up) Lights
Blue- Electric Brakes
Purple- Auxiliary Power

It sounds like your green and yello wires are shorted together somewhere along the length of the harness. I would check the wires on the trailer first. Easier yet, if you have another trailer to connec or access to another to use for testing, connect to it and see if the problem repeats; if it does the trouble is in the vehicle's wiring.

Jun 26, 2011 | 2001 GMC Jimmy

2 Answers

I have a Ram 3500 that I use to pull a horse trailer-the electrical is through a 7way connection. All of the lights,on the trailer, work except the left turn signal. There is power at the tab on the...


This is a trailer question, but I will try.. Connection is broken between pin and connector so no power will pass....Buy a new plug. Sorry.

Sep 22, 2009 | 2008 Ford F-350

4 Answers

Trailer lights


This is the tow vehicle end. The brown wire ( #6 terminal) is the one to concentrate on. It must have a bad connection either in plug at bumper or wherever mounted, or follow it back toward front of vehicle, and will likely have a connector just behind bumper area, or up near frame as well. Best thing is to use a test light ($5-$10) and probe toward front until you get power showing, then work back to plug to isolate. Begin by checking terminal at plug with blinker on, if no flashing of test light, find brown wire on back of plug & test there, and keep going toward front of truck, especially concentrate on connection areas. Understand? If not, get back to me538a5b8.gif

Aug 29, 2009 | 2004 Dodge Ram 1500

2 Answers

I only have taillights coming out of the trailer plug


so, the trailer has no brake lights, or turn signals, just tail lights? Everything (all lights) on truck work ok? What do you have for trailer wiring hook up 4, 5, 6, or 7 way? There is no fuse, the lights all work off the tow vehicle lights, so if the tow vehicle lights all work properly, it's probably a wiring problem, such as bad grounds, loose connections, etc. Get a volt meter and check voltage at truck plug to see if power is getting that far. If truck plug in is ok, wiring problem is the trailer. Make sure all grounds are tight and rust free, that's a common problem.

May 20, 2009 | 2004 Chevrolet Silverado

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