Join Date: Nov 2010
Location: South Fayette/Pittsburgh PA
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the easiest thing to do is a resistance check where the glow plug harness goes into the engine harness. There's a 4 pin connector on each bank with each pin relating to one glow plug. Resistance to ground should be approx 2-3 ohms. Any higher and you can suspect either the glowplug or harness has internal high resistance which will generate a DTC.
In my opinion its not worth it to change the harness or the plugs individually. Just get 4 plugs and a harness and be done with it. It would be wise to use motorcraft glow plugs too.
Ford Senior Master Tech
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2015 F-250 XLT 6.7L
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