Join Date: Mar 2007
Location: Darby, Montana
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Sounds like it may possibly be a fuel delivery problem. It makes not 1 iota of sense that it will start if the engine is plugged in and the glow plugs are all working, but won't start if it isn't plugged in. Did you check the relay? My glow plugs were all good when mine did the same thing but my relay was not putting enough juice through it to cause the plugs to get hot enough to work. Recheck the voltage on the relay and then check the voltage to the plugs at the harness. Plus try cycling the glow plugs 5 times and see if it then fires.
When you have it plugged in and it starts, how long does it turn over before she cranks? And you have of course drained the water out of your filter if you are in a cold area right?
99 4X4 Superduty extended cab Centurion 7.3 factory turbo Powerstroke, Edge Performance Chip, 2013 Harley Davidson FLHTK Ultra Limited Electra Glide. "Kilt Wearing Old Fart Biker"