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Re: Horn won't blow even after replacing fuse.
Clean all the connections at the horn. Check for power at the horn. If there is power at the horn, check for a good earth. You may even fit a new earth cable. Failing these solutions, you may need to get a replacement horn.
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Normally there is a horn relay, try replacing that. The contacts can weld together and keep the horn on. If you take the relay out and leave it out, you won't have a horn but at least it won't be blowing all the time.
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.
possible horn itself is faulty and needs replacing. you will need to locate where the horn is and apply power to the horn from the battery. if the horn sounds then you know that it is a broken wire th=o the horn
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.
Maybe horn became unplugged. Put 12 v power to horn make sure horn works. Put test light on terminal on horn have someone press the horn button, if light comes on and horn does not blow you may need new horn. if light does not come on you may have bad contact at horn button, blown fuse, broken wire, bad horn relay or possibly just a bad ground.
Check the fuse first. should be in the drivers footwell. Make sure that it is not blown. 90% of the time fuse will just blow due to high resistance from one of the horns. There is a high and low horn often it requires to replace one and try the horn and see if it blows. Then replace the horn that blows the fuse.