Did your batteries take a charge or have any charge left? That many months they could be not only discharged but be damaged/ruined and not able to take a charge any more. If they are properly connected the fuse may be bad, poor connection from corrosion or line gone bad. Rats sometimes eat wires.
If you have a good battery then hook it up and see it that fixes the problem which would indicate battery failure.
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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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