block heater need fix tonight! - Ford Powerstroke Diesel Forum
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Old 01-29-2014, 05:39 PM
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block heater need fix tonight!

So my 05 block heater is tripping the GFCI outlets in my garage (first time for two years). I did some research to test my B.H. plug, got 15 OHMS on my meter, so that says GOOD! I went and bought the correct extension cord (12G/15Amps/25 ft) and it's STILL tripping the darn plugs.

I have 3 outlets in garage and one on my porch tied into a 20 amp breaker w/ one plug being GFCI, and one GFCI as a stand alone (not sure where it's tied into). It trips both of them after about 5 seconds of being plugged in after a long rest, and immediately after hitting the reset button each time.

Any help? I'd really love to have this fixed tonight if possible!
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Old 01-30-2014, 04:07 PM
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Well, it fixed itself.
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Old 01-30-2014, 04:12 PM
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Check yer block heater cord... I have had to repair 2 of them this winter... cord broke at the cordend. If its breaking it could cause gfi to trip. Broken insulation on the wire shorting to ground wire or truck intermittently. As an electrician I have seen it before.

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Old 01-30-2014, 04:46 PM
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Cord is good. No cuts or frays. Had good Ohm resistance. I think it was ice build up on the heater cord on the motor. Everything works now.
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Old 01-31-2014, 03:14 PM
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Remove the cord from the heater element in the block, spray and clean the connections (plug and cord), use a good dielectric grease when plugging the cord back into the heater element.
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