99 jeep wont start and the starter works battery is good what could be thew problem?

the tests are all easy,
check fuses first, on all electric fails, starter ,charge and EFI are all electric systems.

super easy.

1. jumper cable cranked with donor running car work?
2. yes, battery is dead, or only discharged, charge it work?
3. yes jumps but charge fails, bingo battery toast.
4. so the jumper fails. in #1 , all that is a bad starting system. (not a part, the system)
5. clean battery lugs. check fuses, and then hot wire the starter solenoid lug (dinky lug ,not huge one) (in park and wheels chocked keys off)
6. ok that fails the starter is bad.
7. ok that works. so the KEY line is dead. try starting in neutral yet?> bingo works, bad PRNDL switch on tranny side.
8. the KEY line can be interrupted with some alarms, on a jeep it has Immobilizer that cuts fuel not cranking. so.... PRNDL switch bad or the key switch is self .
9. Using any voltmeter to do the checks is a WIN. 12.6vdc is a charged battery is yours 12.6v rested/???????????

first try and go back to unhooking battery and cleaning teminals real good with wire brush and put them back on tight you might have good enough contact to light up dash but not enough to start

will it start with a jump? check battery for full charge, maybe alternator is not charging, check battery connections all the way down to starter, check selonoid by cross jumping terminals to engage starter.

I know this is not a caravan but it is a chrysler. Recently on a caravan i ran into the same thing and it was the computer that was stopping the engine from cranking and running. Check with the nearest dealer because some of these computers had warranties extended because of problems. Are you sure the starter is ok. You can pull the starter relay under the hood and jump power from the battery to the relay point of connection after you remove the relay. This will cause the starter to turn over the engine. It still won't run if the computer is the problem but you will know the starter is ok which points more to the computer being bad. If this helps please reply and good luck

make sure ground wire is properly routed and the starter cable from battery to starter is in good shape and not all corroaded if the battery is good then the problem is in the cables or starter

Did you overheat real bad ?
could be a blown HEAD GASKET I hope its not
3 things you need to run
GAS AIR AND SPARK

Check the Starter Solenoid mounted near the battery.Check it out in the dark...have someone try to start it and see if it sparks at the solenoid.connections may be loose.Also check/wiggle wiring harness to starter.

Sounds like a bad starter.

Check the neutral position switch. this may need to be replaced or adjusted.

if the battery is good and you jump the starter she should run otherwise you may have a sensor issue, try to get a hold of a code reader and see if any codes have popped up..