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Chances are it's your glow plug relay has an open in it's coil windings or its your GPCM (glow plug control module) depending on which year you have.....? Or less likely that you have 4-6 glow plugs that have opens and are not working.... start with the module or relay (depending on year) and go from their. Good luck.

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Q: Why will your Ford F-350 diesel not start when ambient temperature is below 70 degrees but will start when it has the block heater plugged in?
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