Question about Toyota 4Runner

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I cant figure out how to wire in a 4prong trailer pigtail to a 91 toyota 4 runner because the break and turn light are not the same wire.

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Go to your nearest auto parts store and ask them for a connector that plugs in the factory harness. that adapts a 5 wire toyota system to a 4 wire trailer system. thats the easyest way but I can tell you how to wire it up but it's kinda complicated.

Posted on Jul 20, 2009

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The SIMPLE way to do it is...

You can buy replacement taillight bulbs with wiring pigtail wiring hanging out of the side of the bulb. You'd use them to replace your existing taillight bulbs and connect your trailer harness to the pigtail wires. You may need to drill through the taillight housing to get the harness wiring in to the bulbs - if you have to do that, seal it back up around the wiring with RTV silicone.

That's a lot easier than tracking down each wire, probing it to find out what it does, and splicing into it with pinch splices (which aren't very reliable), then periodically replacing the pinch splices that've gone bad and made your trailer lights fail. You can make a pretty good splice to the pigtailed taillight bulbs, and it's really easy to tell what each pigtail does - brake/turn or park light.

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Please let me know if you have questions, and thanks for using FixYa.

Function Pigtail color Van color
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My 91 toyota 3.0 v6 4 runner doesnt have spark, yet the coil and ignition coil are good.. why


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Where are the wires to connect the trailer breke wires to on the back of a 2005 Toyota Tacoma TRD 4x4. I found the connector under the dash for the brake controler and a spot for a 30 amp fuse in the fuse...


check inside the break light compartment.
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Electrical system not sending voltage to trailer light pigtail.


Check the owners manual. There are usually different fuses for the trailer, brown-running, yellow-left turn/brake, green-right turn/brake. White is ground. Also try http://www.etrailer.com/faq-wiring.aspx. They have a great website with lots of info.

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I have a 2008 Toyota Highlander with the TO factory option. I installed an aftermarket trailer hitch. Do I just need a trailer light pigtail (to connect to the connector in the rear) or must I also...


I believe the box also is a safety feature in case of a wiring problem from some event, like an accident.
You need a converter to convert the turn signals and brake lights to run off the one bulb on the trailer. A flat 4 pole connector is the usual connection. A 4 to 5 pole converter may also be needed to add the backup light power to disengage the surge brakes while backing up If your trailer has that option. 4 to 5 is not really necessary but it eliminates having to get out and move the connector or insert the brake bypass key.

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i would use a multimeter to read each wires operation voltage before hooking up. ex. turn on turn signal, connect meter to find which wires is pulsing.

So your saying you wired the trailer yourself? yes you need the wires to both sides for brake and running. the runners have to be all connected, and the brake all connected, hot and neutral.

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I recommend that you tighten the ground wire screw for starters. since the vehicle is ten years old corrosion may be the culprit.

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