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Yes, left side of the main frame rail. I don't have any pictures handy, but there are I believe two one inch square relays that plug into sockets. I found this older thread:
http://forums.bmwmoa.org/showthread.php?76198-Cleaning-electrical-connections
And this is for a /6 but probably more or less the same, but there's another picture for a '78 R100RS:
http://forums.bmwmoa.org/showthread.php?46131-R-90-6-cable-amp-wiring-routing
Always hot wires are red
Always hot wires are red
I believe, that there is a hot wire (not turned off by the ignition switch) going to the horn relay even though one would think that it wouldn't need to be hot, but it is!
Yeah, found some of all of the above this morning on a projectThe problem is that sometimes the color is obscured by dirt, wrapping, clutter, etc.
Yeah, found some of all of the above this morning on a project
Also, relays CAN be dis-assembled (carefully), and cleaned and re-assembled. Usually, they get full of corrosion and gunk and will not make good contact. Also, being down there near the master brake cylinder doesn't help as when the cylinder develops a leak (as they can being old now) sometimes that brake fluid will seep into the relays.