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The horn is very cheap and totally accessible, its easy to test it, you want to know if it works but isn't getting power, or if it is getting power but dead. The easiest way to test if an electronic component is getting power is with a voltmeter (you can buy one for as little as $2). Connect the lead of the voltmeter to the leads where they connect to the horn, have someone press the horn button from the drivers seat of the car, and see if there is any power going to the horn. If there is no power, then follow the leads from the horn to their source, look for damage, or a blown fuse in the fuse box under the hood (drivers side). You can test if the horn is working directly by first disconnecting the wires already attached to it, and then connecting jumper cables or suitable test wiring directly from your car battery to the horn - only connect it for a split second, wear some hearing protection! If you hear no horn blast with a direct connection, you just need to buy a replacement horn, they are very inexpensive and easy to install.
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