I assume you are testing with the ignition on, correct?

Sounds like a wire might be burned out, or maybe it is the ignition switch, but I would imagine you'd be having other accessory issues.

I would check for continuity between the ignition switch and F15.

__________________
-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