I will add my vote to Ozz in that operator error is ultimately a cause in a large percentage of the cases. I did it the first time I tried to unhook from the trailer. We have one of the lube disks in place on our hitch and it is hard to tell when the hitch is "unloaded". I kept raising the front of the FW and almost as soon as I began to lift the truck bed with the kingpin the fuse blew. I have since started to key on the "sound" of the motor to tell when it is unloaded. Just last weekend when unhitching at the dealers, DW was working the landing gear and I was intently watching the gap between the hitch strike plate and the king pin. I didn't see the gap but heard the motor unload but before I could say anything the fuse blew.
I am tempted to move up to the 40A fuse but have the same concerns that Ozz raises on second guessing the electrical engineers. Replacing a fuse is alot easier than replacing the motor if the higher rated fuse causes a decrease in life of the electrical motor.
Bill
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Bill and Lisa Rearick
2023 Grand Design Reflection 367BHS
2020 GMC SIERRA 2500 Denali, 8 ft bed, SRW, Duramax Diesel w/10 speed Alison Transmission.
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