horn

[bearsfan34]

I installed an aftermarket horn on my 68 charger. When I blew it, it wouldn't stop and eventually burned out. I put a new one in and now it don't work at all. The wire is hot going into the relay but I have no light coming on when I put the tester on the wire under the steering wheel? I think it is the relay but not sure if I should be getting a light when I test that wire under the wheel. The new horn works I already tested it. All the wires in the column look good and it is a new harness. I was told there is a fuse for it but in my fuse box, I see nothing that says horn. Any suggestions as to what is wrong. Thanks in advance

[70 sublime]

The horn wire in the steering column is just a ground wire
If there is nothing drawing power on the other end you will not get any light in your test light

[Nacho-RT74]

The horn trigger is as mentioned a ground signal coming from horn switch on column ( black wire )

Then the relay gets a constant positive ( violet wire ) from fuse box since 70, but straight from alt stud on earliers which is the power source, and the positive output ( green wire with red traces ) once relay is triggered from horn switch.

Horn gets the relay signal ( positive ) and is chassis grounded.

I hope this will clarify where amd how to test to find the problem.

[bearsfan34]

Thank you guys for answering, much appreciated. haven't had a chance since to work on it, too busy.

[OzCharger69]

Are you using an airhorn or Dixie horn?

The stock wiring won't hold the amp draw. I had to use a relay and power from battery directly, it's impressive how many amps those mini compressors pull.