Rear Lamp Failure

Had this problem back in 1998 and tracked it down to a corroded connector.

Symptom: After about an hour of operation with the lights on the VIC would indicate a "LAMP FAILURE".  Uppon surveying all lamps none were out or dim.

It took quite a while before I found out what was happening.  Actually I found the problem when installing a towing harness.

Just inside on the back (called the "D Pillar") there is a six pin connector. Odds are one of the pins has corroded and is only making connection
every now and then.