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When you pull the connector off the glow plug, measure its resistance to ground before you trouble to unscrew it. For example from the tip of the plug to the intake manifold you should get .6 ohm on a good plug and a lot more on a bad one. Like 30 ohms up to infinity. Never heard about disconnecting them when it's started.
_________________ 05CRD: GDE Hot ECU & TCM tunes, Provent, Cat filter, Facet lift pump, TransGo kit, Florida TC, Samcos, stainless brake lines, HDS thermostat, Renegade light bar, Bilstein adjustables, Al's Gen 4.5 Arms, 235/85-16 Duratracs, DTT rear, Elocker front, EVIC+TPMS, Turbo timer, McNally pillar gauges, Weeks Stage II kit.
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