A quick test using a multimeter (under $15 at Harbor Freight, lowes, home, menards).
With the engine off you should have at least 12 volts. Under that and battery life is severely effected.
With the motor on you should be in the 13 14 range, battery is charging.
If your battery is not charging than it could be the system problem shown above. Also, make sure posts are clean and the clamps are tight. If you can move them they are way to loose. Even a little corrosion will stop the 12 volts from getting through to the battery.
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2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Andersen WDH hitch, Renogy 100 AH Lithium &
200 Watts solar panels from Renogy
Prev. '14 Jeep Grand Cherokee Overland, gas 3.6 V6
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