Can a block heater element go bad??

[Rick6.0]

Hello all. My truck is an '06 F350 w/6.0. And my block heater is acting...odd. During this winter season (Cape Cod, MA), I have been trying to plug my truck in anywhere I can. But it keeps popping GFI outlets everywhere. At work and at home. All except for 1 GFI on the back of my house. Last year I could plug it in anywhere and it would work just fine. So I figured it was the cable. Swapped it out for a brand new one, but that didn't change anything. Still pops GFI outlets. Leading me to believe I either got a bad cord or the heating element is somehow shot. Thoughts?

[2000-7.3L]

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[ZMANN]

u can OHM them to see if the spec is correct ( i don't have the value handy but it's the same as a water heater element )

and FYI GFI's are sensitive to heating elements