I have a 1992 dodge dakota V6 3.9L it will start and run for about 30 seconds then shut down

start the truck and rev the engine does it keep running if not its electrical if it does its hard to diagnose without special tools try that test and get back to me

i tried starting it today and it wouldnt start just clicks tried jump starting it as well same thing

Check all the connections to the battery and starter, if they look good tap on the starter and then see if it starts. It's probably shot

What it sounds like to me is that your alternator isnt workin right

you have a point there.