I have a 85 300sd. I have a problem with the fuse number 15 which controls the overhead light, antenna, trunk light, door lights, and the sun visor lights. Every time I change the fuse it burns out on me. I can keep the fuse from burning if I keep the interior overhead light disconnected which made me believe that the problem is the actual assembly of the overhead light. I changed the overhead light assembly and the problem was still there. Obviously there is something that causes the fuse to burn out. I wonder where else I can start looking. I already checked if the antenna, all the door lights and the trunk light and everything seems fine. The only things left is to remove the front section of the interior headliner to find out if there is a short caused somewhere else (possibly the sun visor light). But before I do that does anyone have an idea where the short is occurring and causing the fuse to burn?

Thank you

It may be the visor. I reinstalled the visor clip wrong on mine and it shorted on the screw. It kept burning the fuse. Took me awhile to figure it out.

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81 300SD daily driver/project
86 420SEL (sold)
85 380SE(in the graveyard)

Also look at the door puddle lights. One was broken on my car when I got it, causing a short.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

Dittos on that in my 86 300sdl. One rear door puddle light was shorted because it was cracked and the wire was shorting on the door frame.

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John
1986 300sdl
1985 380se