Does the car start ok? Aside from the combination switch being sticky, the only thing I can think of would be a voltage issue from either the battery or alternator. It's a shot in the dark (no pun intended), but it might be worth taking a meter to it when you get the chance.

__________________
_______________________________
(Oo{=|=}oO) 1983 MB 300D USA, 212,000mi. 80's yellow/white. "Gunther"
(Oo{=|=}oO) 1984 MB 300D Euro, Turbo Added in Germany, 186,000mi [SOLD] Missing her dearly.
(Oo{=|=}oO) 1984 MB 300D USA Turbodiesel, 269,000mi. [SOLD]