Sounds to me as though the problem is at the dashboard end.
The bulb does not earth at the dash end its connected to switched live supply!
--Which sounds like its disappeared, and its now the lamp is earthing through summit Else connected to that particular line
Earthing the black wire at the glow-timer should light the lamp!
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http://i190.photobucket.com/albums/z...0TDnoplate.jpg
Alastair AKA H.C.II South Wales, U.K. based member
W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.
W114, 1975 280E Custard Yellow,
-Great above decks
needs chassis welding--Really will do it this year....