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Does anyone know if it is possible to replace the alarm horn (located beside the battery) with an aftermarket alarm siren. I have a spare aftermarket alarm siren and would to use it in place of the factory horn, which seems to be defective anyhow. I have a 97 Boxster and have performed many of the "open circuit" tests that I have read about on here and get no sound out of the factory unit at all. The only thing that worries me is the "floating" 9.1 current that the connector reads at the horn plug. Any advice would be appreciated.

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Not sure about aftermarket horns but I replaced my 986S horn part 996 637 117 03 from Pelican Parts, was only around $12 (east pacific pesos!).

I also had a stray current at the horn connector, I don't have the circuit diagrams handy, but I remember there is a monitoring circuit flowing.

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Not sure about aftermarket horns but I replaced my 986S horn part 996 637 117 03 from Pelican Parts, was only around $12 (east pacific pesos!).

I also had a stray current at the horn connector, I don't have the circuit diagrams handy, but I remember there is a monitoring circuit flowing.

Thanks for your help mattatk! I found the replacement part on Pelican parts, hopefully this will fix my problem.

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The alarm horn is like a normal 12 volt horn. Remove the horn and test it with a 12 volt battery. If it does not make noise then there is an adjustment screw. The screw is covered with a plastic plug. Remove the plug and you can then turn the screw in or out. If you turn the screw while it is hooked up to 12 volts you might get it to work. I was able to get a "dead" horn working this way. But it sounded funny so it was replaced.

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