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Re: Never thought a Horn could be so challenging
I would check continuity from the terminals on the base to the connection at the horn. Check for 12v on the base terminals you should have a constant voltage on at least one of terminals. You should get 12v on another terminal when you push the horn button. If all of those conditions test properly, you either have the wrong relay for your base or you got a bad new relay (this happens more often than you think these days). Match up the diagram to the terminals you have identified.
Usually, the problem is the relay. The other common problems occur at connectors.
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