Sorry about that. I got a little confused between posting in the tech help and the 129 forums. One of the previously posted authors had a '91 300 sl. He noted that the overvoltage relay for his car was located in the engine compartment near the passenger firewall under some plastic covers. I checked this area in my car. No OVP relay.

You are absolutely correct. I was totally presumptuous that "true experts" would know whether or not this specific and rare car had an OVP relay. Thanks for setting me straight on this complex issue!

Ray