Hi.

I am trying to repair an old M230 W123 from 1976 that has a problem
where the fuse burns out as soon as you turn on the lights.

I have tried to disconnect both front lights and back lights and I
have disconnected the alternator. When I switch the lights on the fuse
still burnes out.

First of all, I don't have an electric diagram so I can't figure out
what is connected with the light system, if anything else is plugged
into that fuse.

Secondly, I am unsure what fuse should be placed in the socket, but I
am guessing its a 16A - am I right?

The fusebox looks like this (each one represents a fuse):

1111111
1111111 <- this is the one burning out, the last 1 on the bottom
right.

Any feedback would be greatly appreciated.

Kind regards.