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Q: on the fly 4wd won't engage on 2000 Ford F-250 Super Duty

has manual hubs, dash guage incicator lights when started and cycles out, switchlight dosen't light, hooked up scanner, show switch cycles from 2wd to 4wd,4wd off,4low off, 4wd drive power on, 4wd plat A open, b open, c closed, d closed
BOO off, cw shift motor off, ccw shift motor off clutch lock disengaged, dtc count 6 11.9v gem, checked fuses all test good any thoughts
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