I have a 2000 ford excursion 7.3 L diesel and I need to know where to buy the GPCM as I have the same error code P0683, I live in ontario canada but I am going to buffalo at end of September your parts are at least 75% cheaper than in Canada, I also need to buy the wiring harness for all the glow plugs bought after market in canada and they didn't work.
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try this one; Tousley Ford Parts Depot

 

I've bought one from riffraff diesel for our 01

 

Here you go. Please let me know if you have any questions.

Riffraff Diesel: GPCM/ Glow Plug Control Module