Can't Get Enough
Join Date: Mar 2000
Location: So. Jersey
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I'm into this myself. All of the lamps with the exception of the turn signals get their grounds from the circular clip? that holds the socket into the gauge cluster. The bulb fits into the socket with it's ground-the brass part of the bulb's base-up against this clip. In turn the speedo gauge cluster has to have a good ground that I think it picks up from it's four mounting ears. Quite possibly you're loosing a ground at one point or the way this thing is designed maybe many places. Check for 12v at the orange wires with the parking lights on and a known good ground. Good Luck.
Today's mighty oak is just yesterday's nut that held its ground!