Tail lights on my 2000 Cav are not working. I started from the most basic issue by replacing the bulbs, but that did not work. I then moved on to replacing the pigtails that the bulbs are socketed into because the inside plug was corroded with yellow gunk. This did not seem to fix the problem either. Fuses are fine. The one part that confuses me is that the part the pigtails plug into (not sure what they're called) goes between a green-light/no-light (on a voltometer). That may be the problem, or not, but I am open to suggestions. If anyone can tell me that part's name, I'll go from that point.
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The 1999-2004 Grand Cherokees had some lighting issues with the tail lights. First check to see if you have power back there with a test light, if you do try changing the bulbs. If that doesn't work, Inspect the bulb sockets to see if they are burned. The issue that I saw the most was the tail light housing being warpped and breaking contact with the bulb socket. The only fix to that is to replace the tail light assemblies. Hope this helps.
Did you replace the relay for the day time running lights which for some dumb reason is mounted under the front bumper? Climb under and look straight up and you should see it...mine was mounted in about the center (on the frame in front of the radiator. Sounds similar to an issue I had and it cleared up once I replaced the part...had to get from dealer still.
We had the same issue with our 2000 Pontiac Montana.Brake lights, turn signal lights, running lights, back-up lights and emergency flasher didn’t work at all or operated at random. The cause: poorly designed aluminum contacts on the tail light circuit board and wiring harness connector arced over and disintegrated with normal use.
Pull the tail lamp assembly, remove the electrical connector and look for burned contacts on the connector plug and the connector socket (they call this long plastic piece with the socket the circuit board: it includes the four bulb sockets.Replace the circuit board and the wiring connector.
You can DIY this job with basic auto mechanical/electrical skills and tools. The two circuit boards and the two connectors set me back $230 (2009 cost) for new parts.The electrical contacts on the factory replacement parts are improved.
I needed a T-30 torx driver to remove the tail light assembly (you need this to change out bulbs, too), wire cutters, wire strippers, electrical tape and an electrical lug crimper to do the job.