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Old 12-11-2007
rdy4mud's Avatar
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Join Date: Jun 2006
Location: Howell, NJ
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tail light problem

so in my 91 ranger i am having some problems. my rear taillights dont work nor my corner lights in the front. i have checked all fuses and possible solutions. im absolutly completely lost on what it could be. im getting ready to rip out the whole harness and put a new one in. im guessing it has to do with a bad ground somewhere. its not the light switch bc the wires are getting power out of the switch but the wires behind the tails are dead. has anyone had this problem?
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Old 12-12-2007
V8 Level II's Avatar
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The exterior running lights are on fuse 10. The output wire from #10 is tan/white and goes to the headlight switch. The color code from the headlight switch to the running lights is solid brown.

If there is power to the hot side of the fuse and the fuse is OK, then there is no short to ground after the fuse. That means that you are looking for a break (open) in the circuit somewhere.

Although it could be a wire or connector problem, the primary suspect on Gen 2 Rangers is the headlight switch. Check for voltage on both sides of the switch (tan/white and brown). The tan/white should be hot at all times. The brown should be hot in both the PARKING LIGHT and HEADLIGHT positions.

[Note: It is possible to have the headlamps working and still have a bad switch for the running lights. There are 4 separate sets of switch contacts in the Gen 2 headlight switch.]

There are three separate ground points for the exterior lights, one for the tails and one each for the corners. It's hard to believe that they would all fail at the same time. All of the grounds are in the engine bay on the inner fender aprons and the radiator support.

Last edited by V8 Level II; 12-12-2007 at 11:56 AM.
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Old 12-12-2007
FireRanger's Avatar  
Join Date: May 2004
Location: CT
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The headlights switch is usually culprit in these situations.
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Old 12-12-2007
rdy4mud's Avatar
Thread Starter
Join Date: Jun 2006
Location: Howell, NJ
Posts: 252
i thought that too but i actually bought a new headlight switch from autozone a while back and it didnt fix the problem. ugh i hate wires lol ill get out the volt tester and go to work again. thanks guys
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