Dodge Repair Questions? Ask a Mechanic for Answers ASAP
sounds like you have a dead starter, BUT FIRST have you tested BOTH batteries and the cables?
on a 16 year old truck especially the cummins the cables were known to "wear" and create a lot of resistance, a single "click" is the starter solenoid engaging BUT there may not be enough amperage available to turn over the engine, 99 times out of 100 it's a dead starter but i like to verify there is good battery voltage available at the starter as well.
using a volt meter verify the battery voltage doesn't drop below 10 volts IN START if it does check the cables and batteries if NOT start with replacing teh starter, DON't forget to verify the ground cables are intact and in good condition
like i said a single CLICK means the starter is getting the signal and either the solenoid has failed, the motor portion has a dead spot or there is a poor connection, assuming you checked the cables WITH A VOLTMETER(preferably) and didn't just do a visual inspection, the starter has failed, your wheel lock feature only locks the wheel NOTHING else, and only locks the wheel in 1 spot (with an airbag we had to strengthen the column greatly and the "wheel lock" is low on the "totem pole" and was eliminated a few model years later
the starter only has 2 wires a signal from the ignition switch (battery power in START ONLY) and full battery power directly from the battery if you have both the starter is dead, remember you have a 16 year old truck and the starter is a very high demand part i have replaced starters on far younger vehicles.
the test for a bad starter is very easy, battery power at teh heavy red battery terminal and battery power at the smaller wire IN START ONLY, got both replace the starter with a good quality reman or better yet new one and re test
following up to see if you still need assistance