[W126 Coupe] W126 SEL lighting issue

[David Fatovic]

I have a question, this just arose on my dad's 85 Euro
500 SEC.  

I am not sure on all of the details, but from what I
can gather, the turn signals stopped working, when
either turn signal is used, nothing happens, it
doesn't seem like a light out.  Also he said the
headlights only work on high beams, not on low.  I had
him check all the fuses, and he said all looked good
(I haven't checked myself) He did replace the fuse on
the over voltage protection relay, he said that was
bad.  

Any ideas?

David