Originally Posted by gregoryc.
I have a 2000 GC and noticed a problem with the drivers side brake lamp. Lamp works fine normally but when I turn on the headlights and apply the brakes, the brake lamp (running light) goes out instead of illuminating brighter. The passenger side works fine, normally and with the headlights on. Any ideas on where to start looking.
Is this something that just cropped up by itself, or has somebody been working on the rear of the Jeep lately? Say installing a hitch and wiring harness, perhaps?
If no one has done any work back there recently, then the next thing to check is the bulb itself. Make sure it is the right type and has no corrosion. Likewise, check the contacts in the socket for corrosion. Ensure the bulb is inserted correctly. It's difficult, but they can
be put in backwards.
If all else fails, swap bulbs from left to right and see if the problem persists.