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Found aunused plugin going into trunk could this be for the trailer lighting

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  • Cars & Trucks Master
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It could be for a trailer. If it is for a trailer it will usually be a 4 prong black plug with a white,yellow.green and brown wires. Some manufactures will have plugs installed in wiring harness that are not used and are for different options on different vehicles

Posted on Apr 12, 2015

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1998 Chevy Silverado 1500 Brake light fuse blew, replaced, fuse blew again, replaced relay and fuses. both under hood and in side fuse panel. Fuses keep blowing on turn signal and brake lights. Checked...


you obviously have a short to ground on one of the wires to the back (if it was the front the brake shouldn't blow the fuse). the most common problem is usually in a trailer light harness. if you look under the drivers side rear of the truck, down under the tail light there will be a plugin junction. pull this plug-in apart and see if the fuse still blows. if it does then the problem is forward of that connector, if it doesn't then the problem is behind that plugin. be sure to check for "green death" (electrical corrosion) at all joints especially any trailer hook ups.

Oct 25, 2012 | 1999 Chevrolet Silverado 1500

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I own a Mahindra Bolero and my tail lights don't


Just out of curiosity is there trailer lights plugin installed if so the plugin could be creating a neg ground for your lights

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How to identify rear turn signal and stop light wires in trunk to connect trailer lights


in the trunk there should be a multi plug near the lights on the left and right side, disconnect the plug, turn on the left or right indicator depending on what side you are working on first, use a test light (they are about $5 from your auto store) find a good earth on the vehicle body and connect the alligator clip on the test light to the earth, use the probe on the test light and touch each terminal in the multi plug until the test light blinks, that will be your blinker wire for that side, when you have found them see which colour wire it is and tag them.
Now turn of your indicators and turn on your park lights, use the same method as you used for the blinkers and tag either wire as you will only need one for the parking lights.
Now turn off the parking lights and get a friend to apply the footbrake, use the same method again and tak one wire as you only need the one for the brakes.
Now just connect the wires from the trailer to the wires in the vehicle and remember to connect the earth wire from the vehicle connector plug to the vehicle body

Oct 08, 2010 | 2000 Mercury Grand Marquis

1 Answer

Batt wont charge on my trailer from my 2009 f-150


Here's a wiring diagram

If you look at the illustration, it shows the center is an auxiliary power source. If there's nothing hooked on the tow vehicle's plug, you may need to run a wire to the switched side of the starter solenoid. Make sure you fuse it with an inline fuse. Make sure your wire in sufficient gauge and your fuse is ample to protect all your circuitry. you may even want to put a 20a circuit breaker inline and then run from cable that at least matches or is a gauge size higher than the trailer's aux power cabling size..



Oct 25, 2009 | 2009 Ford F-150

1 Answer

2006 Ford F250 Super Duty no running light for trailer and keep blowing a fuse


have seen this a few times on fords. I'm assuming it only blows when you use the trailer. then the only cause can be a shorted wire somewhere between the trailer connector to the lights at the rear of the trailer or maybe the light assembly is bad. If the problem happens when you have no trailer hooked up then inspect the trunk harness. and wiring under the bumpers. Something 12v got pinched.

Sep 28, 2009 | 2006 Ford F-250 Super Duty

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

How do you hook up trailer lights on my 1999 gmc 4x4 Suburban


If your only going with a flat 4 connector, you will have a connection behind rear bumper area that you can buy an adapter to put between the connectors & flat 4 will connect from there, otherwise you can splice into your light harness in back of cargo area, behind panel in the corner. That's all provided your only going with a flat 4. If you need more info, just let me know.

Jun 28, 2009 | 1999 GMC Suburban

1 Answer

03 chevrolet silverado brake lights will not work.


You have a bad ground re test the trailer connection's

Apr 20, 2009 | 2003 Chevrolet Silverado 2500HD

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