Brake Light Connected to Horn

[QuechuaGrl]

(I hope this doesn't seem too immature..) To make my story a bit shorter: I'm playing a prank on my friend. I found an idea where you connect the brake light switch in a car to the horn relay, causing the horn to sound whenever the brakes are applied. I'm not quite sure of what year my friend's Blazer is, however I'm sure that it is not very 'old'. If anyone could please tell me/inform me the process that is entailed, I would appreciate it! (unfortunately, I do not know much about cars) Is this illegal?-- who could I ask for help on this? Thank you!!

[Grim Reaper]

You would have to use a second relay to do it. The brake lights switch the positive on and off. The horn button goes to ground. a relay would let you triger the horn.

Wiring on the relay would be.

85 tied to brake light switch.
86 ground.
30 ground.
87 to the horn triger wire on the colum harness. Its black and towards the end to the long flat plug.

[Norwegian]

I conected the horn to the left hand turninglight. Really fun as he was passing the people whoo was walking home from work. hehe.

Some friends of mine fastened an f-16 braking shute on the rear axel on a colegues car, and hid it under the car. A bit scary since it did not fold out until he was passing a big truck in 50Mph. Not recomended.

Another colegue of mine allways had to heat up the key hole on the dor to get the key in, in the winter, so in the spring when it was not freezing cold, we had superglue on the keyhole... and he, same prosedure as last time.. tryed to melt the "ice" with his hand. hehe

[alf4444]

Here one that is cheap and easier go down to an electrical supply house and buy a fire alarm horn strobe (like what is used in commercial buildings), there small and easy to wire in. Just splice the two wires in one to ground the other to brake lights etc... This can easily be done in under a minute. With this you not only get that anoying siren but a flashing strobe too,