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United States of America
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I think you're dealing with more than the stock theft deterrent.

I don't think the interior lights flash when the alarm is triggered, could be wrong on that. I also don't think the stock alarm does any chirping when disconnecting and reconnecting battery, again could be wrong on that.

Look around your engine bay to see if you have any additional siren horns. The stock alarm horn is on the firewall near the brake booster.

Easiest way to disable the stock alarm is jumper the hood pin switch, on the wiring harness side not the switch side.

 

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United States of America
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