Many newly acquired MB's or even long time owned have electrical gremlins.
A great number of these can be eliminated by just getting a proper fuse in the right clean fuse block location

Ceramic body fuses with copper/bronze fuse elements are sure the way to go.

Sets of these can be found on fleabay for a full fuse replacement with extras for around $10.

These can sure be a very easy way to improve your MB.

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1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T

"If you dont have time to do it safely, you dont have time to do it"

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."

I go along with that!
Over time the fuse sockets and the contact caps can orrode, depending on the climate the vehicle is in.
I had for example, the A/C cabin fan cut out randomly. The cause, a corroded fuse!
While I had the fues box open, I removed the fuses and rplaced them with new ones, all of them!
Before reinserting the new ones, I applied a little dielectric grease to the contacts, after I gave them a short metal brush treatment.

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Mostly, I don't know notin, I just know where to look.
I am looking back, to over 30 years in Electronics Design.
Electrons don't care if they move in a car, computer or relay!

95 W124 E320 M104.992 - Because, I love to repair, naaaah!
Over 221,000 Miles
Cheers,
Norbert

Be careful with this stuff! Some years ago I made the mistake of buying this junk only to discover that the body of these fuses is not ceramic but plastic and the conductor is not copper/bronze but some cheap coated metal.

It's hard to find the real fuses wthout paying an arm and a leg, so whenever I'm at a wrecking yard I check for them on any German car. I always find some that are the real thing.

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Don't Chrome them; polish them