It wont be the glow plugs, I am yet to replace a set on JK CRDS, even ones coming up to 300k are still ok.
Its either the intake pump or a failing TIPM.
Turn the key to "on" and listen for the fuel pump priming, if this fails to prime, the car will struggle to start and when it does it will puff out a bit of black smoke..
The car requires 2200+psi of fuel rail pressure before the injectors fire, a dying battery will crank slowly and take a while to build up to this pressure, which leads to a failed starter motor. In your case it has already died once..
1. Check the voltage of the battery by doing a load test.
2. Check fuel pressure from intake pump to fuel filter to ensure its working when it should.
3. if you turn the key but don't always hear the pump priming, you need to open up the TIPM and inspect for damage/blown faulty board.
Join the CRD jk owner facebook page, its not a common fault but ive had to deal with it more times then I would have liked. 90% of the time its a failed intake pump
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