Do you have a battery tester or voltage meter. If you are getting good voltage at the battery terminals than it is a connection problems.
Clean and tighten attachment to the battery terminals.
As above, check that the ground is clean and tight, no paint, rust or corrosion.
If there are any joints in the battery cables, check them to make sure still good and not corroded or come apart.
Inside your electric converter box there is a grounding bar. The connection there to the frame can come loose.
Fuses in the box have to be pulled and checked.
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2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
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