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Discussion Starter #1
I got a new F150 diesel last week, and it is as nice and I had hoped. I had a 2014 with the 3.5 engine, and am loving the improved fuel economy.

Anyway, one cold night this week, I plugged in the block heater and it immediately tripped the GFCI. I tried several extension cords, and even my heavy 10 gauge cord was tripping it, so I don't think it was the cord, and the plug is fairly new. I am going to bring it to have it looked at, but wanted to see if this happened to anyone else.
 

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2018 Ford F-150 Powerstroke diesel King Ranch
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Your engine block heater is shorting. There is a recall for it. I had the same problem. Ford replaced under warranty, works fine now.
 

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I am no electrician but this can occur when the ground and the neutral are bonded. I have had this occur on my recreational vehicles. In the past I have disconnected the ground. If the dealer has a better fix that is good.
 

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Discussion Starter #5
Yes, last year I had the second block heater recall done and that solved the issue.
 
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