1930 Model A horn

[JoeMarine]

Gents,
I'm back and with every post I get closer and closer to being "up and complete" with my vehicle. I purchased a Spartan horn from MAC this week and it came in today. I went out and installed it on my car and you guessed it. It did not work. I have completely re-wired the car so all the harnesses are new and everything else electrical works. I looked at the previous posts on horns and also reread chapter 1-199 in my service and repair manual and came up blank with a solution to my problem. Could the problem be as simple as replacing the "horn rod?" Thanks in advance for any assistance.
Semper Fidelis
Joe Marine

[Herb Concord Ca]

Hi Joe, remove the horn cover, you should measure 6 volts on both terminals, the horn button takes the horn to ground. Remove both wires, find the one that has 6 volts and connect it to either terminal. Using a jumper wire ground the other horn terminal, it should work. If it does you have a problem with the horn button making a ground connection.
If it doesn't work, call Mac and ask for a replacement.
Good luck,
herb

[Tom Wesenberg]

I'm guessing the adjustment screw isn't screwed in too far. The ratchet barely touches on a good working horn. With the screw in too far the motor doesn't have enough torque to spin.

[JoeMarine]

Thank you Herb. I ran the jumper wire and yes. . .it did work. Looks like it's the wires in my horn rod or the horn rod itself. I'll look to get the horn replacement wire kit that Bratton sells to see if that's it before buying a new rod. More to follow

[JoeMarine]

Herb, thanks again for all your support. The Horn Rod did the trick and yes, it now sounds great!!!!

Tom, I backed off the screw also and it sounds great. Knowledge passed!!!
Semper Fidelis
Joe Marine

[whirnot]

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Originally Posted by Tom Wesenberg

I'm guessing the adjustment screw isn't screwed in too far. The ratchet barely touches on a good working horn. With the screw in too far the motor doesn't have enough torque to spin.

Interesting you say that. I rebuilt my horn a couple of months ago. I found I had to crank the adjuster down quite a bit to keep it from over driving. Guess I got it too free! It does sound good though, and loud!