65 c10 horn wiring question

[Chrisc]

I found a older thread with my exact problem but the op never said if he figured it out. I rewired the truck with a AAW harness which uses a 3 pin relay. Red 12+, green to horn and black from the horn button. I have power at red wire, neg at the green and nothing at the black, , When i press the horn the black wire goes to ground, green stays ground (shouldnt green go to 12+?)but no horn. I can cross the red and green out and horn blows so i know the wiring to the horn and my ground out there is good. When i press the button you cant hear the horn relay click but you can faintly feel it. My first time messing with a horn relay so didnt know if that was normal or not.

[ray_mcavoy]

That sounds like you have a bad horn relay.

When you push the horn button, it completes the circuit to ground (on the black wire) to energize the horn relay. That should cause the relay contacts to close (connecting the red & green wires) to send power to the horn.

Some relays are louder than others when the contacts close, but yours being faint could be an indication that the contacts aren't fully closing. Or, the contacts might just be bad (burned/pitted) and not making a good electrical connection. In any case, the testing you have done indicates the horn, horn button, and wiring is all okay so replacing the relay should fix the problem.

Edit: By the way, the 3-pin relay used with the AAW Classic Update harness is a common horn relay that was used in many GM & Chrysler vehicles from the 70's up into the 90's. So ordering one for say a 73-87 GM truck should get you the correct part.

[Chrisc]

Thank you, i was thinking it should be working. I will pick up a new horn relay.