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Working on a 1972 Chevelle.

The horn relay is up on the firewall near the brake booster on these cars. Mine has one large threaded lug that several wires connect to and it also has two blade connectors on the side of the relay. I have a question about two wires that plug into what would be the left side of the relay as you are facing the firewall, looking over the engine toward the passengers compartment.

What do those two wires do? I know they plug into the side of that relay but beyond that I have no idea of their function. Both have factory plus so I assume they are original. I thought they did something with the horn but I need to verfy.

Can anyone advise what each of them do and how to tell which one plugs into which connector?
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