If you have an aftermarket alarm system is has gone bad. If it is a factory alarm it sounds like you have an alarm that is triggering when the battery is hooked up. If you have a remote clicker, try locking and unlocking it after the battery is hooked up. If no remote, try locking and unlocking the driver's door with the key. If that doesn't work, try leaving the key on as the battery is hooked up.
I have seen where the drivers door latch the micro switch inside goes bad so the alarm cant reset. Check that out as well
Please let us know happens so it will help others.
Best, Ken
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Saturday, February 18th, 2017 AT 4:18 PM