One benefit of having a GPCM not a GPR is it will throw a code if a glow plug starts to draw too much or not enough current. though when the GPCM goes kaput they are about $150 to replace... been there, done that!
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DJ Phoenix (my modded) Hi-1200/240Tow/75FS/80DD/100/140SS +Minotaur
ASE Master Auto Technician 
2001 Ford Excursion 7.3 4x4
Projects. 1970's Hustler and Max II Amphibious ATV's
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