Carl nailed it. While you're at the converter, make sure the 4 reverse polarity fuses are actually good. Visual inspection sometimes isn't enough. You'll need to check them with an ohm meter. Connecting the battery backwards for even a millisecond can blow these fuses.
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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