Since I replaced mine (probably unnecessarily) I am taking apart my old one to see what makes 'em tick. Pictures coming soon.

It looks like a single contact relay, two diodes, and a resistor. If this is the case, fixing one shouldn't be too hard.

I'll bet that half of the issue is simply burnishing the contacts on the relay.

BTW - the rattling appears to be normal. It's a plastic insulator card that's put in there to keep the circuit board off the aluminum box. The relay itself also rattles a bit, and that is normal for relays.

More soon.... Anyone else who has taken one apart care to share?

__________________
-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition