Question about 1985 Toyota Pickup

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Trailer brake lights do not work, trailer is wired correctly

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  • jwmcnieltx Aug 11, 2008

    1991 Toyota pickup 2WD, 2.3 L 4 cyl engine. Trying to figure out why the trailer brake lights will not work. Tail lights, L & R blinkers work normally. The trailer IS wired correctly works with my dad's truck...

  • Bernard J Aug 20, 2008

    I have a similar problem. Interestingly, the brake light pin on the trailer plug shows +12V when the brakes are on; however no voltage/current when connecting a test light.

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Going off of you stating that your trailer is working, then we know the problem is in your truck. Your truck should have a converter box in it. Test the power going into the box, then test the wires coming out. It could be a short in the box, and you might just have to replace it. If you click here, you can view the installation instructions on a converter box.

Also, for this vehicle and year, Draw-Tite recommends running a separate cable to your batter to draw power from your battery to protect the vehicle wiring. It's not *required* but recommended. To view more information about this you can click here.

Also, check fuses, and use a non-conductive grease on the wiring to keep the plug clean.

Hope this helps!

Posted on Nov 13, 2008

  • dana494 Nov 13, 2008

    **REVISION**

    At first I thought the truck was an 85 by the topic, but reading it again I see it listed as 91.

    If it is a 91, and you've tested the box and there is a short, Draw-Tite makes a plug in harness for this truck. It's #118379, and you can buy it here.

    Also, here are the installation instructions.

    This will not fit the T-100 Model.



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I have a 2002 tacoma and have the same problem. From what I was told is that there is supose to be a relay to fix this provblem. I have yet to fix it but what I have been doing is just not using my brakes lol

Posted on Aug 26, 2008

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