My 1987 300E suddenly developed some sort of sporadic loose or poor
electrical connection somewhere.  

A week ago the radio (Blaupunkt replacement) suddenly went dead, no
lights at all on radio panel.  It then would come back on and the
antenna would re-raise.  It happened briefly the first day, then went
dead for a longer period of time, then would suddenly come back on.
Examined the fusebox connections and replaced radio fuse with new red
one with no change.

Yesterday it went dead and I reached up to switch the sunroof up and
found it was dead too, although I could hear a light growling like the
motor was trying to do something.  When the radio was playing, I used
the sunroof switch the radio went dead then came back on when I released
the sunroof switch.

Car starts fine and runs great.  Headlights, turn signals, brake lights
work fine. Interior lights all bright and dashboard instruments work
fine.

Today it was raining and with the radio and sunroof dead, the windshield
wipers were also dead.  The power windows were dead too although their
lights were on in the console. Several miles into my trip all came back
on. Radio blaring, windshield wiper came on, windows worked, sunroof
worked.  Stopped car and hour later when I came out to drive home radio,
wipers, sunroof dead, but windows worked this time.  I opened the
glovebox door and the light was dim orange so slight voltage is flowing.
I can push the display light on the radio and it lights up with time but
won't play radio or CD and goes back dead after a second or two.
Starting or stopping hard do not seem to trigger it.  Seems to be just
not flowing full 12 volts to the radio, sunroof and wipers systems.

Got home, shut off car, then turned ignition back on and everything
working fine and glovebox light now bright.

Where do I start looking?!!

Pete Cowper
California