1997 Mercury Sable Repair Question
Problem installing new stereo.
First put the original radio back in and see what happens. I don't recall ever hearing someone say the radio was involved with the anti-theft system.
Check the fuses too. There will be two of them and one might be on the same circuit as the alarm. One is typically labeled for the radio, but the memory circuit for the radio is generally tied in with some other system that is always live. Interior lights, horn, and cigarette lighter are common circuits.
The old car stereo didn't work that is why I replaced it
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But the alarm wasn't causing an issue with that radio in place.