TXBill, does the coax go to the antenna?
David, did you check under the rear deck area and behind the rear of the trunk? Do all your taillights work? Maybe check for voltage on this wire, with the headlights on, then off. Also, if you bought the car used, perhaps a previous owner wired up a cell phone or car audio power amp, then yanked it out without removing all the extra wiring? My '83 SD had the remnants of a cell phone install remaining, and it wasn't pretty. Lots of extra wiring, and several unwanted electrical gremlins for good measure.
Robert W. Roe
1984 300SD 165,605 miles
[This message has been edited by Robert W. Roe (edited 09-18-1999).]