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I'd start with your block heater element. You can test it with an ohm meter but mine tested fine and was still tripping the GFCI outlet on my house. If you're not handy with a multimeter I'd just pull the element out plug it in and see if it gets hot.

The truck should start without the block heater plugged in so obviously there are other issues, but the block heater working may get you up and running for now.

After the block heater I'd check the most common issues:
  • ohm out the glow plugs to make sure they are good
  • load test batteries
  • check voltage across glow plug relay to make sure it's working correctly
Let us know what you find out.
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