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Is this an aftermarket alarm system?
Try disconnecting the battery again. Once you have it disconnected turn your ignition switch to the run position and then hook up the battery with the key still in the run position. Then try and start it.
Ok other than disconnecting the alarm and removing it I wouldn't know what other way to go about it. Would you like info on removing it, or I can release your question to see if you have better luck with another tech.
Ok sorry I couldn't be more help.
Hi Im David, remove the aftermarket alarm system. they cause so many headaches for people because of the way they are wired improperly.
sometimes that works, but most of the time it needs totally removed