1988 300E Electrical Problems Interior Lighting

The interior courtesy lights operate erratically or sometimes not at all when activated by opening the driver's door. The other 3 doors work fine. Sometimes they flicker, don't come on at all, come on eventually, and other
times work properly. They had quit working at all until a tech. worked on the system.
Any suggestions would be most appreciated Thank You Brian
PS it isn't the door switch
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Why are you so sure?
IIRC there are two switches on the drivers door.
Change the fuses.
Change the bulbs.
Clean up your ground terminals.
And tell us more history. What did the tech do?
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Change the driver door switch...
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I agree. Try manipulating the driver door switch by hand. Twist the plunger and press it in. If the light come on for a brief period or stay on after that, then it's the door switch.
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