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Do a quick load test. Either go to advance auto and have them do it, either fully charge battery, turn on your low beam with engine off, leave it about 10 min, then measure the battery. Should have over 12v, I think should be closer to 12.5. You should also check if alternator charges it properly (with engine running, you should have around 14v on the battery, less than 13.5 and more than 15 is a problem).
But with this picky Diesel engine that wants a very healthy battery, more for ECM purpose, you may still need a new battery... Many people complained about red tops lately. Also, a min 800 cca rated battery is needed for crd.
But glad for you it's only the battery, that's an easy fix.
_________________ 2005 kj CRD, samco, suncoast tc, provent, Kennedy lift pump, GDE ECO full torque, 2nd gen filter head, 245/70/16 a/t tires, mopar light bar, fumoto oil valve, OEM Skid Plates, ARB Front bumper and HD OME, tru cool LPD47391 40k GVW tranny cooler (stock cooler delete), FF Dynamics e-fan and shroud, rocker arms replaced, HDS2 190F thermostat.
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