Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks


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#409426 06/09/18 11:07 PM
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Pete34 Offline OP
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I’m looking for some help on fixing the horn in a 34 truck. The horn doesn’t sound when I hit the button, all I get is a click at the horn. I wired the horn directly to a 12v battery and it beeped. The truck has a 12v system. The horn is original. The electrical system does have a horn relay in the fuse block. And I have a resistor in line to reduce the volts down. Has anyone experienced something similar or can you give me some recommendations to check to get this horn working?

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Pete
To me it sounds like the horn needs adjusting, There will most likely be a screw (possibly with a lock nut) on the back of the main body, this adjusts the sound of the horn but if it is too far in or out the horn does as you say "click". The easy way is have someone hold the button down while you do the adjust the screw (the noise may upset the neighbours) and the hard way is to adjust the screw a little then push the button then repeat until it makes the required sound. You dont need to turn the screw very far to make it work.
Tony


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Hi Pete,

My 12 volt 1977 impala has this problem about every 2 or 3 years. For me it is just a ground problem and tightening up the bolt fastener on the horn bracket takes care of it. The same problem can be duplicated with a poorly charged battery. Electrical components do not do well when not well grounded. I don't like to make horn internal adjustment until everything else is tried.

Good luck, Mike


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Pete34 Offline OP
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I didn't try adjusting since it does work when I hot wired it directly to the battery and it beeped just fine. And when I did that the horn itself wasn't mounted at all so I'm thinking thats not the issue. I appreciate those ideas just wished one of them worked. Any other ideas out there? I'm not the best with the electrical end of things. Just still perplexed.

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Even though the horn worked on the bench, it might still be a ground issue (the horn bracket not grounding well) when it is mounted in the car.

To help ensure a good ground, lightly sand the paint and corrosion around the bolt area on the bracket itself and also where the bracket mounts. Then, place a star lock washer between the bracket and its mount, which will dig into the steel and help ensure a good ground.

Hope this helps.

Cheers, Dean

Last edited by Rustoholic; 06/11/18 10:40 PM.

Dean 'Rustoholic' Meltz
old and ugly is beautiful!



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If it works off the car now it isnt adjustment and as others have said check the earths.
Tony


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The '34 horn does not need to be grounded. One wire to the horn terminals is always hot and the other provides the ground when the horn button is pushed (completing the circuit).

The horn requires a significant amount of power to operate the electromagnet so the entire circuit must be in good condition. I suspect that the ground circuit from the horn is the problem. It can be wire size, condition of contacts, etc. My suggestion is to trace the wiring so you know which is the hot terminal (will have battery voltage if you use a meter). The take a wire and ground the other terminal. Holding one end on the terminal while touching the other end of the wire to a bare spot on the engine, chassis or ? should result in the horn sounding. If it doesn't then the wiring from the battery to the horn is suspect. If is does sound then the circuit through the horn button is suspect. If you have a meter you can check the resistance from the horn, through the button and then the ground. There are several places that can have a problem. Testing the circuit in sections will find the problem(s).


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