I have a 1984 300D that recently developed a problem with the ignition.
Frequently, the key won't turn out of position 0. As soon as the
problem began, I ordered a new key (cut to code) and installed a new
tumbler set. This seemed to fix the problem for a day or two, but now
the problem has returned. Perhaps coincidentally, I have also been
having problems with the battery. I have had to recharge it twice
Any advice on what to check next?
Not terribly familiar with this year of vehicle, but is the ignition
lock electrically-operated? With a dead battery, it's possible that
there's not enough current to unlock the ignition.
If you've needed to recharge the battery twice recently, perhaps it
would be prudent to get a new battery? It'd be interesting to see if the
problem disappears afterwards...
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