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1999 - 2016 Super Duty 1999 to 2016 Ford F250, F350, F450 and F550 Super Duty with diesel V8 and gas V8 and V10 engines
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No 4x4 operation

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Old Sep 30, 2010 | 02:50 PM
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No 4x4 operation

I have a 99 F250 superduty with a 5.4. The 4x4 light on the dash is on, but it is not in 4wheel. There is a p1820 code in the GEM. Anyone have this same problem.
 
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Old Oct 1, 2010 | 08:51 AM
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P1820 Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure.

Check the shift relays. They are in a small black box near the master cylinder and the main power distribution box under the hood. Sounds like one of them failed, the contacts are dirty where it plugs into the harness, or otherwise.
 
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