Block heater is tripping GFI or regular circut in the house?

[tbirdfiend281]

I've plugged my truck in to both type of outlets. Both on a timer. Occasionally the GFCI would be tripped in the morning. IIRC is was when either it rained or snowed. My best guess is that the water made a connection between the terminals and made the GFCI trip.

mine use to do this very thing, it would take out my dads bathroom when it would rain, so hed come in my room hooting and hollering all early in the mourning about my bag of crap diesel and how he didnt have lights in his bathroom