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Message: [QUOTE="robrike1, post: 1550086, member: 33184"] I've got a 2004 F250 6.0 and have been having random cold crank issues. Normally 25 to 35f when I start it in the morning. The last few days I've had to crank for about 8 to 11 seconds before it fires up versus the normal 2 or 3 seconds. When it does get going it blows white smoke for awhile so I was suspecting a glowplug issue. Connected my bluetooth adapter this morning after another hard to start leaving work a and all 8 glowplugs had thrown a code. I suspected GPCM and pulled the connectors and ohm'd them out. Black connector all were fine but on green all but one were open. After checking for wire breaks and even ohm'ing from green GPCM plug to the connector where the glow plug wiring harness was it all showed open. Doing a test on glow plug wiring harness plug directly showed all within 5 ohms so glowplug harness and glowplugs on driver side is good. The wires from GPCM green connector to connector that its into driver side glowplug harness seems to be open. 2 different voltmeter were used. Another odd thing I think is the black and green connectors battery pin both show 12 volts when key is on engine off. When I turn key off i still have 12 volts at the connectors battery pin. I'm not sure if that is normal or not. I went into this thinking my GPCM was bad and now it seems one side of wire harness may be bad but I still had 8 plugs throw codes rather than 4. I'm stumped and regrouping. If anyone has any suggestions or seems to have had the wire harness from GPCM to the glowplug wire harness connector fail I'd love to hear how it went. It is so weird that that main harness that has the harness from green connector to bus bar connector has all 4 wires open but no other issues with other sensors that branch off that big harness. Going to clean oil out of turbo inlet hoses I took off to do my work initially and then maybe button it up and see what happens. Is the 12 volts constant on the battery pins on the glow plug green and black connector normal with key off??? Thanks for any ideas, Robert Sent from my SM-G955U using Tapatalk [/QUOTE]