car battery wont stay charged on 1998 Jeep Grand Cherokee

the battery loses its charge somehow. we tested at was low but good.fine for a day or so, then it starts but immediately quits when I put in drive.

Asked by for the 1998 Jeep Grand Cherokee
1 answer
Retest your battery. If the Cold Cranking Amps (CCA) is not up to specifications on the Battery label, replace it. Also make sure your charging system is working properly and battery cables are clean and secure.