71 K-5 wiring Question

[Bahamabob1]

71 K5 factory a/c 350 /350 CST, the question I have is, in the engine bay on the firewall left of the power brake unit iare 2 relays, factory installed looking and no stereo,lights,extra stuff

what do they control ?

the horn is inside by the fuse box and the fan relay on the passenger side of the AC behind the glove box.

Just can't find anything on any other wiring sites

thanks in advance