Hello...my horn doesn't work. I guess it's possible one could work without the other but neither does, maybe suggesting the problem isn't those parts ?

The relay gets power from the horn button. I can't see or reach much up from underneath to the driver's side horn to check continuity there, but it seems there's a clip with a green wire going in and another going out to the pass. side horn.

Where's the ground ? should there be a ground wire or is the horn grounded by being bolted on ?

 

The horn grounds through the core support. The relay gets power from the battery. The horn button connects the black wire to ground, which energizes the relay coil and connects the green wire to battery power. If the relay clicks, the horn button works. Do you get power on the green wire when the relay clicks? If not, the relay contacts are likely pitted or corroded inside the relay. If you do get power, the problem is the horn itself. You can test the horn easily. Simply unbolt it from the core support. Connect the terminal to the battery + terminal and connect the horn mounting bracket to the - terminal.

 

Hi...I can't tell if there's power to the horn thru the green wire because I can't reach up under the bumper and hold the multimeter in place in the clip. Is the horn easy to remove ?

 

You can start by seeing if there is power at the terminal on the horn relay that the green wire plugs into. Also, if you remove the radiator top plate, it makes it easy to reach the horns.

 

yes, there is power at the relay where the green wire plugs into. the fault is somewhere between there and the horns. I guess they work independently (both are grounded)?

 

They are wired in parallel, so the operate independently. If only one is plugged in, that one will still work. I'd test the horns themselves next. That's frequently the problem.

 

OK thx....I will remove one horn and connect directly to the battery. But, if both horns are out I think you are suggesting it could be that the green wire connections are corroded. Thanks for the tip....

 

Correct, but if you can reach the horns to remove them for test, you can also reach the other end of the green wire to check it.