A problem that I and others have had is the rubber grommet where the power leads go into the motor. Water has a way of getting in that opening and causing corrosion.
The rubber grommet deteriorates over time. I cleaned mine up when I saw the rubber torn and sealed it with Liquid Electrical tape.
2011- 351RLTS Eagle, MorRyde suspension/pin box,
2017- F350 6.7 PSD Lariat FX4,SRW, SB,CC
Hughes PWD SP-50A, TST TPMS
Gator roll-up bed cover
B&W Turnover ball, Andersen Ultimate 3220
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