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Join Date: Apr 2010
Location: Clinton, MS
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That is the method that I was looking for in my links too. Thanks, Stoked777. I had it bookmarked but the link no longer brings up any valid address...perhaps the page was moved or deleted - probably a server migration thing.
The method described by Stoked777 should bring up DTC codes. As you cycle through them, write them down. You may post the codes here or do a search for the descriptions. My guess is that you have a loose harness or a wire is shorted or a glow plug could be broken.
I'm not aware that any of these causes the "wait to start" or "glow plug warming up" indicator to remain illuminated though. It might not hurt to check out the fuze panel as well.
You can also check each glow plug with a voltmeter for continuity and each glow plug socket/connector as well.
I haven't tried to read codes by the Key Off, Odometer Reset, Ignition On method and I don't have any codes to read now.
You don't need to buy a code reader either. All the places like AutoZone, O'Reillys, NAPA, etc. will read codes for you without charge. It is also probably a good idea to get an OASIS report for your truck from the Ford dealer. Just give them the VIN and they'll print it out for you - it will show you recall and warranty work performed on your truck...good for getting an idea of areas the truck may have previous issues mechanically speaking.
Unless the glow plugs stay on all the time I wouldn't worry as long as the truck starts. They get HOT!
Good luck. Safe travels.