98 b2500 beeping sound
 

when i turn on my truck after the initial beeping noise stops, there is some sort of alarm bell that goes off. it beeps about once every second for about 6 seconds then stops and then does it again. and then it won't do it for a while if at all again. I've noticed it only really happens when im driving around the city but not on the highway. Does anybody have any idea what could be causing it?