Shippilot,
To be clear, +/- 240v (or 250v) reading at the 50A shotepower receptacle is expected but ONLY between L1 and L2 if your reading 250v between other poles (see Daryles attachment) you have a serious problem. Post your test readings here for feedback.
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Rip & Beth
2021 3121RL Legacy Cobalt FBP, MORryde IS & pin box
2020 F350 PSD CCLB SRW
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