How to i replace a horn that has three wires to it when the horn I bought only has 2 connectors

Could be a wiring problem or the clockspring in the steering column.
You would need to pull the steering wheel and test the circuits.

Make the FixYa experience better for everyone by voting.
Hi,
My name is Ben and I'm your guru, i.e., mentor, an influential teacher or popular expert: a management guru. - origin from Sanskrit, 'weighty, grave', for today.
Subject: How to check an inoperative horn
Customer's exact description: ...the horn on my 1995 Buick LeSabre does not work...how to fix?
Here's how it's done:
Step 1. Start with the pre-check:

Do a Thorough Visual Inspection
Do a thorough visual and "hands-on" underhood inspection before starting any diagnostic procedure! You can find the cause of many problems by just looking, thereby saving yourself a lot of time. • Has the vehicle been serviced recently? Sometimes things get reconnected in the wrong place, or not at all. • Don't take shortcuts. Inspect connectors and wiring which may be difficult to see due to location.
Step 2. Instructions:
One. Remove the horn relay and check for battery voltage at the relay connector terminals.

• If battery voltage is present at both terminals, go to Two.
• If battery voltage is not present, check the ORN wiring and the relay fuse for circuit.

Two. With the horn switch depressed, measure voltage from the relay terminals. Wear hearing protectors, if someone is assisting you and depressing the horn switch while you're under the hood.

• If voltage is present, go to Three.
• If battery voltage is not present, check the black wire for an open circuit; check the connectors for proper terminal contact; check the in-line connector for proper terminal contact; check the spring loaded contact, slip ring, and horn switch for an open circuit.

Three: Connect a fused jumper from relay connector terminal 30 to terminal 86.

• If the horn does not sound, go to Four.
• If the horns sound, replace the horn relay.

Four: Disconnect the the suspect horn connector. Connect a fused jumper from the suspect horn terminal B (dark green) to the positive + battery terminal.

• If the horn sounds, check the wiring to the horn relay for an open circuit or short to the ground.
• If horn doesn't sound, check the black wiring for an open circuit, if OK, then replace the horn.

All the best,
Ben

the extra pin goes to ground. Cut the connector off the new horn, and connect it to the battery to determine which polarity sounds good. Then solder a terminal on the negative wire and make it long enough to reach a chassis ground point. Cut the connector off the old horn to use for your new horn's positive wire. OK?

You can by-pass the horn pad on the steering wheel and install an after-market Horn Button to operate the horn, and you can purchase an after-market Horn Button from most auto part stores for under five dollars, and there are a few different designs that you can choose from.

You will also need enough ground wire to wire the horn button into your vehicle, and most likely a few wire connectors, and that can all be figured out once you actually see the Horn Button that you purchase.

To install the Horn Button:

First locate the turn signal switch wire connector and it should be on the lower right side of the steering column.

Then locate the Horn wire, it will have battery voltage at the wire and when the horn wire is grounded the Horn will operate or sound, and usually GM used a Black wire with an Orange stripe for the Horn wire at the vehicle wire connector for the turn signal switch from the vehicle wire harness, and the wire usually changed to a solid Black wire on the wire connector from the turn signal switch. However that is not always the case, and the wires should be tested to be certain of the Horn wire.

You can connect a test wire to a good ground and quickly make contact with the wire that you are testing and when the Horn sounds then you have found the right wire. (make contact for only a second and do not ground the wires that you are testing for more than a second or you could blow a fuse)

Once you have successfully located the Horn wire, then on the wire connector from the turn signal switch, cut the horn wire about three inches from the wire connector for the turn signal switch. (or at least enough to connect a wire to the cut Horn wire from the turn signal wire connector)

The rest is simple, you just connect one of the wires from the Horn Button to the cut wire from the turn signal wire connector, and then connect the other wire from the Horn Button to a good ground, and then test the operation of the Horn Button, and if the horn is working with the new Horn Button then mount the Horn Button where you want it to be and the job is complete, and you should then have a fully functional horn again.

I have made you a wire diagram to help assist you, but it is only for a referencre and the wire colors might not match, so be sure that you actually test the wires to find the actual wire for the horn. Let me know if you require any further assisance.

hi sounds like it's had a short some where and blown a fuse check your fuses will be a 10amp fuse regards

First locate the horn in the engine compartment should be between the front grill and radiator core support. Pull the horn off, it has one wire and one bolt holding it on. next clean the bolt area where it is bolted on with sand paper to get a good ground. Sand it on the bottom of the mounting bracket and on the area where the horn bolts on. next get a wire and hook to the positive side of the battery, touch the horn to the negative side so it has a ground then touch the horn wire connector with the wire connected to the positive side of the wire does the horn work? if so it was needing cleaning, if not you will need to replace the horn. There are two things that you can do before you replace it look for a single screw on the horn and back it out three or four turns the try it again before installing, if this makes it work better then you know the problem that the reeds are going out replace the horn for $15.00 at any auto parts store. Or buy a air horn for $20.00 bucks and replace it with that, it's louder and easy to install. Nissan has always had issues with the horn so your not alone on this issue. Also check to see if a wasp built a next inside the horn or a mud dauber may have built a nest in the horn, if there is obstruction in the throat of the horn clean it out and try it again. Of all Nissan's I have worked on I have found it necessary to replace the horn about 90% of the time.

So you have replaced the single horn and it still dosen't work ? both horns or just the one? The reason why the horns are grounded separately is the reason that both horns can operate without the other. double check that ground.

The horn switch provides a ground. If you have no voltage at the horn wire, inside the steering whel, I would suspect a bad spiral cable, or clockspring under the steering wheel.

no/ you have 2 horns your right about that but its one wire connector for each horn usually one horn on the right and the other on the left/ the horns should be slide in connector and if he cut them for one doesnt seem right/ I bet that was the problem he tried using the same wire from the original horns when he kind of grounded the horn so it would not work / but there is only one wire per horn/ Please rate my response/ Thank you very much

well you have two choices you can run a new cicruit which means you need a wire to a fuse and then a wire to a switch and then to the horn and then ground and that will be some work. your other choice is much simpler. find where the old horn is and change the connector to fit the new horn. remove the old horn and replace the new horn in the old spot and ground the horn if you need to since some have a one wire and a body ground so you wont need to hook the ground to anything but the bolt if you need to do that.