Question about 1987 Toyota 4Runner

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Cannot get taillights to work in my 87 4Runner ran another oem wiring harness for taillights

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If you ran a new harness and all the connections are good you may have a bad headlight switch. Also check if you are getting current to lights and that they are grounded. The problem may also be the dimmer switch.

Posted on Jun 28, 2009

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Posted on Jan 02, 2017

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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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  • Loosen and pull back the carpeting in the back of the trunk behind the taillights.
  • Step 2 Remove the plastic wingnuts that secure the taillight to the vehicle's body.
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  • Step 3 Insert the wiring connectors into the vehicle's wiring harness.
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  • Step 1 Push the taillights into position against the body and reinstall the plastic wingnuts that secure them. Be careful not to crush the wiring.
  • Step 2 Route the trailer wiring underneath the carpeting in the trunk, so that the trailer connector can extend out between the trunk lid and bumper when in use, and be tucked into the trunk when not in use.
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