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Check to see if there is 12 volts at the horn positive connection when someone pushes the horn button on the steering wheel. If there is voltage, and no sound, you need a new horn. If there is no voltage when the horn button is pressed, you need to troubleshoot the rest of the electrical circuit. First look in your fuse box for a blown horn fuse. Then try replacing the horn relay.
To install a horn, Buy a horn button from any auto parts store. mount it under dash in a good place to use it. run a wire from horn connection to proper post on switch, run the other wire to a good power source, battery or fuse box. its the same principle as hooking up a light switch in a house. as long as it cuts the power to horn. it will work. There should already be a ground wire on horn itself. Good-Day!
Disconnect the plug from the horn and using a negative and Positive wire that you run directly from the battery make contact with each on the horn contacts. The horn should sound, if it doesn't the horn is bad. If it does and it still doesn't work from the button on the steering wheel, since you have replaced the fuses and relays already, the horn button on the steering wheel is bad.
It sounds like the horn relay is operating but the horn is not getting any power to it. Check where the wiring is attached to the horn contacts for tightness and security. You could test the horn itself by running a jumper wire direct from the battery to the horn contact. If no noise replace horn unit. If jumper wire works, then the relay should be replaced. .
Using a test light check for power at the horn while someone pushs the horn button. also check for bad fuses or relays that are very well labeled in your underhood and dashside fuseblocks. If you have power but the horn dont blow, replace the horn. If you dont have power, go back and dig through fuses and relays. One of these will help to fixya!! Good Luck
Try using a 12volt jumper wire directly to the horn from the car battery. also check the ground on the horn. The last thing I would do is pull the steering wheel cover. Make sure the horn is blowing first.
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