Yes your alrm could have been installed wrong. Depending on where the tech hooked up his wiring he maybe at a spot where the alarm is not allowing the trucks computers to shut down. The trucks computers should shut down after 20 minutes to where it draws only 20 to 30 milliamps. If the tech hooked up his wiring in the wrong locations the computer may never shut down and will stay at 150 to 200 milliamp draw which in this case would drain the battery
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