the difference may be in the model. Mine is the SPP-50X. I'm sure the issue is not in the adapters but in the electronics of the surge protector. A current mis-match can certainly cause a problem. I would definately operate on the advise of the manufacturer.
Sounds like your friend should be able to return the SP he bought since it can't perform as promised by the dealer.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana High Country 305RL
2015 RAM 3500 Crew Cab 4x4 DRW
Demco Recon Hitch on RAM Puck Ball
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