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40cpe · 03-13-2017, 05:18 PM

With one wire going to the horn, the only way to complete the circuit is to have the horn body connected to the car chassis. You might have other problems, but without the horn grounded it can't work. Are you sure the relay is working? Put a test light or volt meter on the connector at the horn. Does it show voltage when the horn button is mashed? Test for voltage at the "B" Terminal of the relay. It should be hot all the time.

03-13-2017, 05:18 PM	#2
40cpe Senior Member Join Date: May 2010 Location: Star, MS Posts: 4,162	Re: 6 to 12 volt horn With one wire going to the horn, the only way to complete the circuit is to have the horn body connected to the car chassis. You might have other problems, but without the horn grounded it can't work. Are you sure the relay is working? Put a test light or volt meter on the connector at the horn. Does it show voltage when the horn button is mashed? Test for voltage at the "B" Terminal of the relay. It should be hot all the time.