Ok , this has me scratching my head. Previous owner of my 99R* removed the front horn to install forward controls but left the wires hanging there.
I purchased a new 2 wire horn to replace the missing one. I have tested the wires and hooked them up every way to Sunday and back, but can not get the horn to work from the button.
With my tester, both wires come live with 12 volts when I turn the key on. This does not seem right. Any ideas ?
I would think 1 should be + and the other - . It also seems that the horn button connects the - negative to make the horn sound.
If I ground 1 wire to the chassis , the rear horn will sound but when I put the tester on that wire, it gives me 12 V +.
Any help out there ?
Brian

Uncle_B_Bear wrote:
Ok , this has me scratching my head. Previous owner of my 99R* removed the front horn to install forward controls but left the wires hanging there.
I purchased a new 2 wire horn to replace the missing one. I have tested the wires and hooked them up every way to Sunday and back, but can not get the horn to work from the button.
With my tester, both wires come live with 12 volts when I turn the key on. This does not seem right. Any ideas ?
I would think 1 should be + and the other - . It also seems that the horn button connects the - negative to make the horn sound.
If I ground 1 wire to the chassis , the rear horn will sound but when I put the tester on that wire, it gives me 12 V +.
Any help out there ?
Brian

Without hitting the button, you can make the rear horn sound, or is that when hitting the switch?
It does makes sense that the wire has 12 volts on it, you're completing the circuit when it connects ground.

You have to figure that when the horn is sounding, there is 12 volts positive on both sides of the horn. Even what you think of as the "negative" wire will have 12 volts positive on it, as it is heading back to ground/negative.

Edit before your answer: If you are hitting the switch to get the rear horn to sound, leave that wire grounded, and test the other wire for 12 volts.

Hey Brian, the brown wire is your hot, always on with key switch. The pink is your ground and goes through the horn button. OK lets start off with this question: Does the one horn work normally when the ignition is on?? That is your starting point. If it does then take your new horn and plug into the same connectors and test it from those same wires. It sounds as if you may have a shorted horn coil on the new horn so you need to make sure from a good starting point whether or not it works. From there take the wires that go to the front horn and hook them up to the existing horn to make sure those wires are still in tack and not shorted or broken.

One other thing, I have found some different horns in the past to not work until the body of the horn was grounded to the frame even with the 2 wires connected, so try that as well.


Hope this helps,
Rod

Hi Rod, Thank you.
The new horn works . When I have 1 terminal to ground and the other to the hot wire and turn on my key, the horn sounds right away without pushing the horn button.

the body of the horn is well grounded and I hook brown and pink wires to new horn and neither horn works. I disconnect the new front horn and the back horn will work properly.

When both horns are hooked, wires switched either way on horn terminals, the head light dims, but there is no horn.

I will try hooking to wires for back horn and see if that works.

Biggest confusion is , I have 12 V + on both wires to front horn. yet I can ground 1 and not blow a fuse , but instead, make the rear horn sound.

I will try your suggestion. Thanks

brian

Mike,
Both wires turn hot soon as the key is turned on. But the rear horn works properly from the horn button