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What kind of temps are you trying to start in? Try plugging in the block heater and if you still have starting problems then it's not related to the GP system.
You can actually test the GP resistance from the connectors on the GPCM. Do you have a wiring diagram?
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.