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Yesterday while driving to the post office a gentleman leaving the grain elevator didn't see me and started to pull out into the street. As I cursed and swerved it occurred to me that I need to fix my horn.

How do I go about diagnosing the problem? I have a multi-meter and I understand the concepts of positive and negative, but other than that I haven't a clue what's going on.
How do I determine if my issue is the horn unit or the wiring / horn button?

ez8,
Switch is in the horn button, wire goes down the column and usually gets damaged and shorts leading to a whole lot of horn. Maybe you're lucky !

First I'd hot wire the horn and see if it's working. Then I'd hook the meter to the horn's leads and see if you're getting 24v when you press the switch. That should get you started on the hunt.

If you need parts for the switch it's best to purchase the whole kit.

Andy

And if you go the kit route, tie a long piece of dental floss to the old horn wire before you fish it out. The floss will allow you to reverse course with the new wire right through the steering shaft
Gary

ashyers wrote:ez8,
Switch is in the horn button, wire goes down the column and usually gets damaged and shorts leading to a whole lot of horn. Maybe you're lucky !

First I'd hot wire the horn and see if it's working. Then I'd hook the meter to the horn's leads and see if you're getting 24v when you press the switch. That should get you started on the hunt.

If you need parts for the switch it's best to purchase the whole kit.

Andy

Does the engine need to be running when I do this or can I just switch the ignition on?

Hi ez8,
Most horns are already wired "hot" as I understand it. If yours is not, it should have current once you switch to "ON" but it is not necessary starting your rig to check.
Gary

always "oh", as I can attest because from time to time when I am under the hood, my your grandson likes to surprise me with a push of the horn button. HC

Went out and hooked it up, no juice at all. No voltage, no resistance.

I can't find how it's connected to the horn button, though. Where's that connection get made?

The M37 horn has two terminals, one is always hot 24V.

The other runs thru the loom, down to a hole in the frame, then up the hollow steering column to pick up a ground when you push the button.

If no +24 at the horn, check under the dash for a bad breaker or disconnected wire.

Prince'OWeird

ez8,
I wanna help, but I'm 12 volt and Painless wiring loom. My hot wire comes from the front part of my harness, always hot. The wire goes down the column, then comes out the bottom of the fitting and is sealed. I'll try and take a pic tomorrow, ok?

it may not work with loudly with 12 volts, if you can, they putting some wires from 12 or 24 volts batteries and see if your horn works with both volts. I ended up with a horn from Hella at 24 volts, bolted right up to the hood mounts. You. get the horn button off by pushing it in and then turning it. Mine will pop off if I tap it hard, but replaced in very easily. I push and not "pop" it to sound it. Horns take a lot of amps to sound off. Hc

I forgot to take the pics!! Promise tomorrow.

I was able to locate the wire in the steering column and test it separately, I also took NAM VET's advice and jumpered the horn to the batteries. The horn works, but the wires don't. I guess the next step is to go through and tear the steering column apart so I can run the wires through there again?

NO don't tear it apart! Tie a piece of floss to the top end then pull the wire out the bottom. The floss will trail behind; once you have your new wire ready to go, attach it to the tag end of the floss then pull it right back up through the steering shaft-so much easier than trying to fish it through! Also, I got a matching 12V horn from Peter DiBella Jeep parts at one of the MVPA Nationals a few years ago.
Gary

I wonder how it sounds!

Mine I believe is a funny "ford A" type horn heheh I believe it was installed by the previous owner and it is not original at all.

It sounds like any other car horn, I guess. A little deeper, maybe. It's a good sound for a horn - very authoritative. I had a Porsche 944 one time that was very fast and very noisy, but it's horn was very meek and sweet. It didn't match the car at all.