Brent, where is the bulb check unit and how is it accessed/removed? Mine has acted flaky from time to time. I also have one rear running light which is driving me crazy. Bulb is fine, I measure 12V at the socket, but bulb does not light.... Then it will work fine for a month or two. Two separate issues.

Rgds,
Chris W.
'95 E300D, 429K

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