OK, I have the pass. dash/kick panel disassembled and have a few questions.
Which is the OVP relay?
Is it the tall relay with the attached 10A fuse?
(Fuse is OK, I will disassemble relay to check inside)

Is there a layout diagram somewhere?
(I see many relays, 5 over the fusebox and 2-3 more above the A/C unit)

It looks like I have a dead ckt, 58R.
Voltage is NOT present at fuses #9 or 13 but I see #9 has no identifier so I assume it is a spare.

I did find the fault affecting the pwr. windows so that is now good.

Is there an online downloadable wiring diagram somewhere I can purchase?

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1986 560 SL (deceased., gave it's life protecting my wife)
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1994 945T (still running strong with an upgraded cam) 349K
1986 242Ti (deceased)
1968 GT500KR (under restoration)