those all sound like crappy af locks. They were probably like lock box locks that just rotate.
The ones I mentioned above work great. They cannot vibrate loosely and life is too short to be constantly worried about an engine fire. I guess if you are, only lock them when you're parked away from home, not driving and unlock before you start your drive again.
Or just get better locking ones, like mine. Pricey, but very nice.
I also have a hood pin set to my alarm in case I forget to lock. Just don't forget to disarm before you open your hood to do something (don
t ask how I know).
and Don, if you want a hood contact pin for an alarm that works, I had to buy a whole set of them...you can have one.