Benzodrene,

First of all this message is for everyone. In electrical questions, one must know the year of manufacture to give a good answer.
I know "All 300E's" are the same, but when it comes to electrical, cars (all cars) change from year to year.
So, If you will give the year of the car, I will look and see if I can help.

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84 500 SEL (307,xxx miles)