air horn install???

[avanti179]

hey everyone, looking for a little help installing a set of fiamm airhorns in my 78 FJ40... i tested them by touching the positive, negative to the battery and they work, and are very loud, but i tried hooking them up to the stock horn harnesses on the passenger side, and when i push the horn button, the compressor kinda sounds like its barely running. i figured the positive side of the stock horn harness might have been restricted for some reason, so i hooked the positive wire directly to the positive battery, and it does the same thing, just kinda mumbles. any help with this would be greatly appreciated...

Brian

 

[hammerhead]

One word - Relay.

I used a horn relay to get mine up to speed. NAPA I think...

 

[jwest]

Thought you were talking about your carb.

Sounds like you're losing amps through old wires, connections or bad grounds.
You're probably better off re-wiring the whole setup.

.

 

[atoyot]

Did your stock horns work before? If not it may be the contact is dirty under the steering wheel. If they did work I would check the output at the positive wire with a tester while your pressing the horn button. With the right power and a good ground they should work. You can also try it on the drivers side horn wire (if applicable).