Replaced my door ajar switch on my 91 sierra 1500, the old one was WORE OUT. It wouldn't even turn the lights off and the new one is significantly more tactile. Now, I'm waiting for the passenger side to go out.
Not much goes wrong anymore, really need to invest on getting my rear sliding window sealed up, all the seals have dry rotted and I've been using RTV to keep it from rattling. haha