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The horn itself may be faulty, disconnect it and use a voltmeter to see if the voltage changes on the wires feeding it when someone presses the horn button. Most horns are 12V so you should also be able to connect the horn directly to the battery to see if it works. Just get the polarity correct.
The horn switch harness. (the switches and wiring in the steering wheel) Disconnect the negative battery connection before attempting to check this as the air bag is also in that area.
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!
find the connector for power on the horn. the ground is likely the connector to the body. run a wire to a button you have mounted in the dash. they sell large horn buttons in autozone. run the wire from the button to the battery. when you press the button you complete the circut from the battery to the horn and the horn will blow if the horn is good. Please check that the horn is good before doing all this work by running power directly to the horn just to check if its working.
I would check for the following:
4. Horn itself (disconnect it from the car, use a wire to connect to horn and tap it directly to the battery, if it horns then it is ok, if not probably need a replacement.
5. Push button on the steering wheel
6. Rotor contact on the steering wheel
IF this is really just temporary, locate the wire going to the horn(s)
Find where you`re going to get the +12V feed, direct from the battery, cigarette lighter, spare hot terminal at fuseblock. any place that`s hot with the key switch off.
Connect one wire of the inline fuse holder to the +12V source you have selected.
If you don`t know for sure that the horn(s) are OK run a wire from the other side of the fuse holder to the horn feed, and connect temporarily, it should honk.
If all is well there run that fused wire to one side of your switch and the other side to the horns.
1Buy a horn kit. Direct replacement kits for the Jeep Grand Cherokee models will have only one horn, but many aftermarket kits consist of two horns.
2Locate the original manufacturer's horn. The horn for the Jeep Grand Cherokee is mounted under the right turn signal behind the front bumper. The easiest way to access it is from underneath the front of your Jeep.
3Disconnect the power connector from the horn, unscrew the mounting bolts with a socket wrench and remove the original horn. If you are installing a factory replacement, you can simply attach the old wiring harness to the new horn and mount it in the original location. However, if you are installing two horns, you will need to find a sturdy location with minimal vibrations.
4Splice the original pair of wires to the two horns according to the instructions for the new horns. The kit should include the connectors that you will need. Generally, you will splice a Y connection to each original wire to produce two pairs of wires that are connected to a new wiring harness. You will then connect each harness to one of the new horns.
5Test the new horns to ensure they work.
*I've done this myself on a few of my Jeeps, these directions are the simplest though, but do not take into account any "issues" . For the simplest fix, i would by a replacement horn (same year and model) from a breakers and install, if you're brave you can buy a cheap one form amazon or ebay.
Check the wires on the horn. Wiggle them while someone activates the horn button. Next connect a hot wire from the battery directly to the horn. If there is no change the problem is probably a bad horn.
Locate the original manufacturer's horns by looking under the hood.the most likely location is under the passenger side headlight.
Remove the passenger headlight. Unscrew two nuts on each side of the
headlight with a socket wrench and remove it to expose the horns. Loosen
the mounting bolt for the old horns with a socket wrench and unplug the
power connectors. Remove the two horns.
Mount the new horns with the attachments that came in the kit. You
should be able to simply mount the new horns in the old brackets if your
kit is a direct factory replacement. Some custom horn kits include air
compressors that may require you to install the horns in a non-standard
Plug the old wiring harnesses into the new horns if they are
compatible to retain the factory wiring. Some aftermarket horn kits may
include a custom wiring harness that you will need to connect to your
car's original wiring using a wire/crimper splitter.
Test the new horns to ensure they work. Be aware that horns that use a compressor will be extremely loud.
if they check out ok
find the horn sometimes they hide them pretty good once u find the horn unplug wires from it and take a jumper wire and hook battery directly to battery if horn doesnt work u have bad horn
if horn works u have a bad wire or bad horn button
no. a horn will not be directly associated with a battery, if so you would have other components within the car that were not working.
I would suspect a horn problem itself or one of the electrical components