Hi Customer (name blocked for privacy)!
In the underhood junction box check where the large red wire bolts to the box. Make sure it is tight and clean. Also, verify you have battery voltage at that point. Check there first, if you have battery voltage then we can step through the wiring and find the problem.
Also be sure the battery cables are clean and tight. The best way to do this is to remove them and clean any hidden corrosion. Then tighten them down onto the battery so that they cannot be moved. If you can wiggle or rotate the cables then there will be a poor connection.
Please perform all of the diagnostics I suggest.
Please
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