Why are car alarm starter kill relay designed to be normally closed? It would make practical sense to make the relay normally open because when the crooks pull the alarm fuse or the alarm unit out of the car, the car shouldn't be able to start. But in fact it's the opposite and crooks knows about this. What are the reasons for alarm companies for making there relay normally open?
Thanks
My Alpine SEC-8049 can operate the starter interrupt relay in either N/C or N/O operation.
So they are not liable when the alarm fails and prevents you from starting your car and you freeze to death in the mountains. My alarm broke, and all I had to do was unplug it, and im off.
Other way is better for anti-theft and in fact current design makes aftermarket kill switches virtually pointless.
So that if the alarm unit fails, you can still drive your car.
------------- Alex
Have something to add? Share your thoughts — no account required.
Ask the community — no account required