@ResqFE Ron: assuming you're running a 3.6L, is your ESS/Aux battery (tested in isolation) fine?From what I've seen, most battery issues are related to the auxilliary battery. The small batteries seem to be highly failure prone wherever they are used, and it may be that in the Jeep application, they are suffering from charge rate regulation/overcharge problems, excessively high loading under some conditions, (ESS) and perhaps getting too much heat from the engine compartment and right side catalytic converter. It seems that auxilliary battery problems become main battery problems in many cases.
the group 94 will fit along with the ess battery with no problem?If you decide to replace the main battery only, many have replaced it with a larger group 94 battery. There is a removable plastic tab in the battery tray to support the smaller factory battery. The group 94 will fill the entire stock tray.