Best Buy installed their house brand Avital alarm in my 87 GN several years ago. It always blows a fuse for the circuit that it is wired into ( fuse for interior lights, door locks) when I go to the track. Also, the battery doesn't stay charged for more than a week when the alarm is engaged and the car sits. I have an appointment tomorrow at Best Buy to have it looked at. It has a lifetime warranty. Anybody else experience these problems with an aftermarket alarm? do I need to step up to something better? Thanks.