Horn fuse should be located in the fuse box under the dash on drivers side kick panel. If fuse is good try replacing the horn itself, it might be bad due to the age of the car. They are located behind the front bumper on the left and right side.
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Sounds like your cruise control module has a short circuit, which would explain why the fuse blew again after starting the car. You can verify this by unplugging the cruise control module then starting the car. Then check the fuse again. If the fuse is blown then the fault is associated with the horn circuit. If the fuse is not blown then you know the fault is associated with the cruise control circuit.
I'd start by hooking 12 volts with a battery charger directly to the horn to see if it blows. then check if you have power to the positive connector when activating the horn button. Then if you dont, see if you have power to the horn relay, located in or near the fuse box
Fuses. Check those in the engine compartment fuse box (far upper left as you face the car). If, after you replace anything that has blown, it blows again, that would suggest a short somewhere in the system. If you mean your brake lights, the fuse you are looking for is probably the 20A STOP/HORN fuse in your under hood box. If you are dealing with just tail lights, I believe the fuse is the 15A SMALL LIGHT fuse. If neither of them is blown, I would open the trunk and check the bulbs in the fixtures. Hope this is of some help.
It could be a fuse, bad wire, bad ground, or a bad horn. First check the fuses, if the fuses are all good take a wire run it from your battery to the horn touch it to the posts, if the horn dosen't work you know the horn is the problem, if it does it is a bad wire or ground.
Sounds like a fuse, in the underhood fuse box, the brake lights & cruise are on the same 20 amp fuse. After replacing the fuse, check the brake lights first. Then see if the horn works, horns usually are the cause for a blown fuse, they short out.