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Re: 2002 Tahoe horn srated blowing for no cause and will...
Hello, although from your brief description of fault May I offer assistance? Not on a Chevrolet but a Volvo 740, the Button on the steering wheel for the horn are Copper semi circular type and sprung loaded. Me being ham fisted with annoyance pushed the button too hard, it worked ok at the time of use but a few minutes later World WAR 3! had to pull plug on horns themselves to silence them.
So FixYa resolution? Check Horn button itself Cuz it'll be stuck!
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try unplugging the horns to see if they are the problem. If the fuse still blows, the problem is the wires from the relay to the horns. If the fuse doesn't blow, plug in one horn at a time to see which one is bad.
Sounds like the horn itself is shorted out. You didn't mention if the blown fuses were a result of using the horn. A horn in construction is an electromagnet acting on a diaphram; if the electromagnet develops a short, it causes an overcurrent condition and will blow the fuse.
Go to the wiring on the horn andd run it back to the fuse box. Replace the fuse or "hot wire" system and see if the horn works. It is also possible to ware out the horn by constantly reminding drivers how poor their driving is. I use to sell for a living and drove 60,000miles per year. I burned my horn out 2 times. Good luck
Most common problem is the ground that the horn connects to wit the bolt is rusted and causes it to pull to much amperage so clean the contact first then if it still blows the fuse then the horn relay or the horn may be going bad.over time the horn gets junk in it and causes the coil to overheat and causes it to burn out. Horns cost $15.00 for a new horn and are easy to change. I doubt the relay is bad but it is always possible.
You can remove the horn relay and use a Ohm meter and check the resistance between the horn relay connector terminal No. 86 (Black Wire) and ground. If the ohms are less then 5 ohms replace the horn relay. There are a lot more tests but as Polarcycle states you can do what he suggested other then I believe you have two horns in this vehicle.
This is probably a temp thing...night brings colder temps. The wiring may be failing or the steering wheel portion over the horn might harden and cause it to touch the center of the horn to make it go off. Let me know if this helps.