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Only if you pull the connector on the EOT sensor. The PCM reads the information from the EOT sensor and uses this to decide when the glow plugs should be turned on, and how long they will cycle. By unplugging the EOT sensor you are tricking the PCM to think that the engine is cold.
If you are not getting the same voltage on both large terminals then we can go into checking the coil side of the relay and the wiring that pertains to it.
99.5 F-250 4x4, 7.3 PS
State 1 injectors from Rosewood, GT38 (van) turbo, S&B intake, Comp Cam's 910 valve springs, Smith Brothers pushrods, AIH delete TS 6-position chip. Pyro.
2005 front end conversion, 2008 tailgate, taillights, and rear bumper.
Edge CTS monitor, and 4" Exhaust (Manufacturer to be determined).