Jeeps and Heat

[NPC 20883467]

Have other owners found cranking their JLs to be somewhat sluggish in heat waves like I just have?

A sluggish starter motor when cranked at normal operating temperatures is the classic symptom of a starter motor on the way out. As your starter dates back to '18, you might want to have it checked out.

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[THAW]

A vehicle designed to have a single battery will detect a failing battery correctly. A vehicle designed to have dual batteries that is spoofed to only have one will not trigger warnings or failsafes because the management logic is seeing and acting upon a 2nd battery that doesn't exist.

I'm not saying the Aux delete is wrong or bad. It just has a possibly significant con at the end of battery life that isn't readily apparent. Suddenly finding your Jeep with insufficient electrical power to operate can range from an inconvenience to a survival situation depending on how it is used. Where does your use case lie?

The AUX (ESS) battery disconnect and fuse F42 removal essentially preserves the normal warnings. That is, the cold crank voltage test originally done on the AUX (ESS) battery is shifted to the CR[an]K battery.

The main difference is actually just that there's no longer a scenario where one battery fails when the other could pass.