It's the crank sensor!
Join Date: Nov 2007
Location: Central Minnesota
Shayne.....Gotta say I'm a bit confused here.
You mention that "the starter engages, but the engine doesn't crank at all". That is where the confusion comes in, as that is kind of a contradiction in terms.
By the way you describe it, it sounds like the engine does NOT turn over. Is this correct?
If that is the case, the problem could indeed be electrical (cables, battery, voltage drop, relays, etc) but this problem would not be related to the crank sensor.
The crank sensor would come into play if the engine turns over normally, but doesn't actually fire up/start.
Lets make sure we're all on the same page here so we can give you the most accurate help.
99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!