Hello, my 4wd suddenly stopped engaging. The switch lights up but front wheels don't engage/pull. I checked for voltage to the coil and its correct. I removed it and inserted a ratchet extension rod into it and switched on and it does magnetize but feels weak. I can pull the rod right out. How strong is the coil magnet suppossed to be? Would you guys suspect the coil is bad or the solenoid valve itself? I tried removing the valve itself but can't get a wrench or socket on it. Hope its just the coil. Any ideas? SER#4ZN02115
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