I have an electrical problem that I need a little guidance on solving. This in an '87 300SDL.
When the headlamps are turned on the bulb out lamp illuminates on the dash. I suspect a loose connexion rather than a bulb being out since repeated walking-arounds show no lights being out. The guy that I purchased the sedan from had replaced the original head lamp assemblies with "Euro-style" units which is why I'm suspicious of a loose connexion.
Last week, I was making a left hand turn with the turn signal engaged, headlamps on. The turn lamps both fore and aft now come on, but do not flash when the switch is engaged. This occurs only when the headlamps are operating or the parking lamps are selected. When the headlamps are not on, the turn signals operate normally.
So, the question is should I look at the relays for the headlamps or consider replacing the headlamp switch? After twenty years, I think that the switch may be a candidate for replacement.
TIA