Mechanics

DO I NEED A NEW HORN?

2001 Pontiac Bonneville • 385,000 miles

My horn quit a yr. Ago and I found the fuse under the hood was blown but upon replacing it the hoe horn makes a sick weak barely audible sound. I banged on it and some water and rust came out. I assume I need a new hor. Do you agree? And where can I get one cheap? The car has nearly 400k on it. Thanks. Mike
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Notapromike
April 3, 2012.



Get one at a parts sotore. Replace the relay as well.

Roy

Why replace the relay? Thanks

Tiny
Notapromike
Apr 4, 2012.
Most likey the horn is the problem. If you want to check it quickley loop a test light in place of the horn and see if it takes out the fuse
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Djcl
Apr 4, 2012.
Horns draw very high current but there's a movable contact that breaks the circuit causing it to vibrate, so the average current isn't so high. When one of the horns gets full of water or debris, it can't turn off so effectively so the average current goes up leading to a blown fuse. That can overheat the contact in the relay. That's why replacement of the relay was recommended. The failure to vibrate properly is why it sounded sick.

There's usually two horns; a high note and a low note. Either one will cause the fuse to blow when it's shorted. You might have to sacrifice a fuse but the only way to identify which horn is shorted is to unplug one of them, install a new fuse, then see if that one horn works and the fuse doesn't blow. Most horns either sound really sick or they're nice and strong.

Horns on this car model are a fairly low failure item so you might consider a used one from a salvage yard. At the dealership I used to work at, they had factory replacements for around $30.00 each, but they pushed universal replacements for nine bucks. They worked just fine but it took a little longer to install one of the supplied mounting brackets.

Caradiodoc
Apr 4, 2012.
Thanks to all who replied and the info to help me understand how a horn works and what my options are. Notapromike

Tiny
Notapromike
Apr 4, 2012.
Good luck

Djcl
Apr 4, 2012.

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