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Inside plugs do not work .Why ? It sames to be in the back of the trailer .

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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

What does tbc fault mean on a 2006 f350


TBC means Trailer Brake Controller fault.Check for moisture/water in the trailer plug connector at the back of your truck. Water/moisture will cause TBC error codes. Look for moisture at all connections to the plug and inside the plug.Trailer brake controller that is built into your dash. If you are hooked up to a trailer it could mean you are losing your connection or ground to the trailer. If you are not connected to a trailer it means there is a problem with your brake controller possibly a short in the wiring caising the fault code. ----- It means either A) you have a bad ground on your trailer. Or B) your cable on your trailer is too short and causing it to pull out of the plug or C) you have a short in the factory trailer harness wiring or the plug is gunked up. --------- get this possibilities checked.It will help.Thanks.Helpmech.

Dec 24, 2010 | 2006 Ford F 350 Super Duty

1 Answer

Can't get the trailer running lights to work on my 2006 F350 Diesel 4X4. Tried the trailer on another vehicle with the same plug and they worked perfectly. All other lights work with the trailer when the...


Check fuse 28 in the fuse block under the left side of the dash. There is also a relay for the trailer park lamps in that same fuse block. The fuse and relay are the trailer parking lamps and run independantly of the vehicles parking lights. You can also try backprobing the other trailer plug (you should have one 7 pin and one 4 pin) to see if there is power at the park light pin. If there is power at the other trailer plug than the fuse and relay are bad and you may have a bad/corroded plug or bad wring to the plug that doesn't work.

Nov 04, 2010 | 2006 Ford F 350 Super Duty

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

1 Answer

Cruise control works when I plug in trailer but does not work without trailer plugged in'


Check your trailer plug connections. It must be shorting out inside, and making your brake lights come on when you drive and cancelling the cruise.

Aug 13, 2009 | 1987 Ford Econoline

1 Answer

Tow plug


you have one of two things going on first check to see if the brake light on the left side is shorted out, it will be a 1157 bulb replace it and see if it works looking good does not mean it's good if it has a single contact then it's a 1156 bulb, check to make sure where the bulb socket is that the rubber inside the socket is not worn out and the bulb is shorting to ground. if it is buy a 1157 pig tail repair kit at any Nappa auto truck store or any trailer store. replace it if it needs it. Next if that does not fix it pull the left wheel off pull the drum off and look at the wires on the inside, if they are bare inside it's shorting out if you don't see a bare wire look at the color of the two wires and with a ohm meter and one wire disconnected from that side touch them at the plug and to ground one at a time you should have one wire going to ground one not if both wires going to the left side show they are shorted then you need to replace the wire or the electric coil. if you need more help just ask. If I can e-mail you I can send you a diagram and show you how to test if yo don't know. good luck.

May 28, 2009 | 1998 Ford F150 Regular Cab

1 Answer

LEFT TRAILER TURN SIGNAL DOES NOT WORK


I'd get a 12vdc test light if you don't have one already & start from plug, and keep probing back from there. It may be as simple as a bad connection under truck where joined into harness.

Nov 29, 2008 | 2000 Dodge Ram 1500 Truck

1 Answer

Trailer lights


check all trailer tow fuses in panel under hood.there is a fuse for trailer brake lights and a fuse for trailer signals.but if one signal is working it is probaly broken or corroded wires at the back of the trailer plug or corroded wires inside plug.

Nov 09, 2008 | 2000 Ford F250 Super Duty Crew Cabs

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