Lights on buzzer - how to troubleshoot and replace

[arownious]

I have a 95 Ford Ranger XLT 5spd and the buzzer does not work. When I leave my keys in or the lights on and open the door it does not make a peep.

I'd like to replace it as I have a tendency to leave my lights on when I'm in a rush. What is the actual part called? I cant find it online. Also, anyone have a clue which fuse it might be in case thats the problem?

 

[garyl]

I don't know anything about the stock units, my truck didn't come with it, but you can get one from jcwhitney that you tap into the fuse panel. I have it on my truck now and it has saved me quite a few times.