I changed the baterry but when i try to start the horns start hawnking

Have you tried putting the key into the ignition switch and starting the car ?

In some vehicles, you can place key into driver door cylinder and manually lock / unlock which may turn horn off.

Sounds like a anti theft. Put your key in the ignition but not in the start. just put it in. See if you can remove the battery now without the horn going off. If you can also find the horn and un hook it. there should be a connection clip if you trace the wire down.

Hope that helps
Dan

Hi, chances are you have at least one bad battery cable. Check them with an ohm meter. If you have any resistance in your reading, say above 0.02 change your cable. Hope that helps.

what type vechicle you working on.

aiarm eather shot or wirers hooked not up right look fore shortdg

If battery and alternator are good is starter solenoid pulling in? it may be that whilst you have a new battery it may require charging new doesn't mean fully charged, batt may have been on shelf for awhile

when the horn starts to honk just put the key in the ignition and turn the car to on, you can also use the key to lock and unlock the drivers door, you are activating the security system by disconnecting the battery doing the above disarms it, if it still won't disarm then you need to see the dealer on this problem

YES,UNPLUG THE HORN AND SEE IF YOUR BATTERY STAYS CHARGE

Install the battery by connecting the positive cable first,then the negative.If this does not work,do it vise-versa.connect the negative first,then the positive cable.If this does not work,connect the battery,and then insert the key and start the engine,if horn stops,let it run for about a minute,then turn the ignition off and remove the key.

I put a new started in my 99 camry the alarm went off and I didn't know how to stop it ,now my car doesn't have any power the battery is new but its not giving my car any power.Help...