An installer should be able to hook it up to an aftermarket alarm. My car didn't have that option but my dad's Taurus did and his alpine alarm works with it. All they do is replace the factory relay with one for you aftermarket alarm. I watched the install so I think i have an idea what is needed. There shouldn't be any problems though.

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The Honkeytonk Monkey
Jewel Green 96se MTX


1996 Contour "Mean Green" (99-02)
2002 Malibu Blue Focus ZX5 - something to hold the PB 15...