Were they on the inside or under the hood? If under the dash on the firewall, it's a horn relay.
If on the firewall under the hood.....well, I still haven't figured that one out yet. On my 70 K10, it had one ignition-on wire running to it (pink), and 4 wires running out. Two went to an A/C compressor type connector (blue/black), one red with a spade, and I can't remember the other one. Regardless, the thing had only one input wire to it, the pinkl one. And that was originally tapped off of the radio power wire.
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