A car alarm works by having several sensors hooked up to a central box that can trip the alarm, or by having wires that are connected to the dome light switch. Discover how crystals make car alarm sensors work withtips from a certified master mechanic in this free video on car accessories. Expert: Thomas Brintzenhofe Bio: Thomas Brintzenhofe has been a certified mechanic for the past 14 years, and a certified master mechanic for the past eight years. Filmmaker: Reel Media LLC…

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