I have an AFI Horn with the letters “SPTD” stamped on it. Which model number is this?

That model has been discontinued since 1994. The closest replacement we offer is our part number 10029XLP. The only difference is the mounting pattern. We no longer offer a horn with the same style of mounting as the SPTD.


I have a dual trumpet electric horn that doesn’t want to sound. It just makes a clicking/chirping sound. What can I do?

We suggest bench-testing the horn and wiring it directly to a 12 volt battery. If it works fine when doing this, then the problem is most likely within the application’s wiring. If the horn still only puts out a clicking sound, that is usually a symptom of one side trying to draw more amps than the other which causes them to cancel each other out. Remove the rear cover and find the screw in the center of the sounding mechanism with a small red dot on or next to it. Turn that screw a little bit counter clockwise and eventually the horn should start to sound properly. If not, keep trying each side, back and forth, counter-clockwise or clockwise. If still no positive reaction after all that, it’s time to replace the horn.

The air horn compressor doesn’t seem to be working. How can I fix it?

It might need some oiling.

  1. Reverse the wires so the compressor “pulls in” rather than “blows out”.
  2. Insert a few drops of light machine oil/ sewing machine oil  into the opening for the hose attachment.
  3. Let the oil swirl around for about 4 – 6 seconds.
  4. Then reverse the wires back to the correct position and allow any excess oil to exit. (Do not allow oil to get into horn)

If this does not improve the functioning of the compressor it may need replacing . The compressor should  put out 9-11 psi.

In regards to the air horns, is it possible to purchase the compressor and horn trumpets separately?

Yes. The part number for the 12 volt compressor is 10102. The 24 volt compressor is part number 10224.

As for the trumpet assemblies, please see below for a list of the most popular kits and the part numbers for the horn(s) only:

Horn kit # Horn only #
10107 11117
10106 11116
10105 11115
10104 11114
10121 20150
10122 20149