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Re: 2002 2500 won't crank
Check Battery voltage. Is it 12.6V? If less, charge the battery. You say everything else works. I assume you are talking about headlights also. Try turing on the headlights and then starting the truck. Have somone watch the headlights while you do this. If the lights go out while you try to crank, you have a connection ( most likly battery terminals) problem or battery problem. Many batterys break down under load
If the lights do not dim, you have a starter problem. If this is the case, smack the starter with a wooden broom handle and then see if it starts. Maybe you can get one start out of it to get it to the shop to get the starter replaced or rebuilt. The reason the smacking may cause the starter to work is that the brushes are worn just to the point where they do not contact the armature. Just a slight smack and you may be able to het them to go the few thousands of an inch to touch the armature.
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How many miles on the car? Have you checked the fuel pressure when it doesn't want to start? Do that first and then move on from there. To quickly test fuel pressure with no special equip get a can of starting fluid from the auto parts store, when it fails to start spray the fluid into the air intake of the engine well it is cranking, if it fires up then the fuel pump is likely not running on for some reason. This can be electrical in nature or just a failed electric fuel pump
My 2003 dodge caravan would not start after driving about 1/2 hour. I stopped for coffee and when got back in to start it started I switched gears and it stalled. I tried to start again switched gears then it started but only for 2 sec. No clicking, no cranking sound just would not start but battery functions were great. Spent 2 days with a mechanic who could not resolve so sent to Dodge. After a day of putting wires back and checking out the problem they said it was the computer. Said that it was bad and could be replaced at no charge due to malfunction. Yes, it worked fine afterwards no more problems. They also said that some of the computers are found to be defective like this one so I hope this helps you in the right choice to have the dealer check it out if you are unable to get a computer reading and there is no obvious short in the system. Free sounded very good but as you know there is no such thing as really free as they got me for other things $350 worth. ouch!
check fuel pump relay/should run pump for two sec when key is turned on. try turning key on but dont crank did pump hum/if it did look towards leaky fuel inj./faulty pressure reg. poss clogged fuel filt.