Compression Ignition Addict
Join Date: Aug 2009
Location: Albuquerque, Nm
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To me, it sounds like your block heater is working fine. The resistance creates heat, therefore heating your block/ coolant. It's not uncommon to have electronices of this type, increase their resistance as the heat goes up.
I think that it's odd that you had no problems last winter, but you do this winter. What gauge extension cord are you using? I personally wouldn't use anything smaller than a 12 gauge, and preferably using a 10 gauge, but that's me.
There could be quite a few things causing this problem. It's tough to say. Do you know what else is on the circuit that you're plugging your truck into? As Toads250 said, he also had an air compressor, freezer on the same circuit he was plugging his truck into. It could be something as minor as an appliance getting a little old, and drawing more current than before. Then you plug in your truck, and pop goes the breaker.
Don't burn your bridges, you might have to cross them again in life.
Don't sugar coat things. It covers up the taste of real life.
Providentia Remedium Belli
Early 1995 F-350 Crew Cab Long Bed
33" Hankook RT03 Muders
DIY Intake w/ Napa 6637 filter
3" DP to 4" exhaust
Charge Air Cooler
Upgraded gear reduction starter
Bypass Oil System
Bypass/ Coolant filter system