Security light flashing?

1999 MERCURY COUGAR
160,000 MILES • 4.0L • 6 CYL • 2WD • AUTOMATIC
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PEGGY WHITE
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  • 3 POSTS
I recently had my alternator replaced and now my car will not start. Anti theft light blinks. Will not turn over or fire-fuel pump kicks on and dash lights come on. The battery was unhooked for a week waiting on my mechanic to come back and fix it. Is it possible all I need is the key reprogrammed? At a loss here.
Dec 12, 2018 at 6:20 PM
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DANNY L
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  • 5,648 POSTS
Hello, I am Danny.

Let's try this first. I have attached a tutorial showing how to rest the security system. Scroll down the page to find Mercury.

https://www.2carpros.com/articles/how-to-reset-a-security-system

Hope this helps and feel free to ask any questions.Thanks for using 2CarPros.
Danny-
Dec 12, 2018 at 10:34 PM