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How man keys do you have for the F350?
No on the fuse. The problem is with the PATS key system. The PATS system needs to see the chip in the key to allow the vehicle to start. If it does not see the chip, it thinks the vehicle is being stolen and disables the starting system and the message "Starting System Fault" appears in the message center. Can you give me the VIN# ***** the mileage so I can check the warranty status?
If the problem is the key, yes. But if it something else in the PATS system, no.
If the key was under water, it is bad. The circuits get shorted out.
If the key worked when parked, and then it got wet, the problem is the key. You should be ok.
You will have to replace the wet key. Drying it out will not fix it.