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Engine Block Heater throwing GFI and Breakers

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Old 02-28-2017, 04:24 PM
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Engine Block Heater throwing GFI and Breakers

I am having a curious issue in that whatever I plug the engine block heater into via extension co0rd, it trips the GFI or the breaker in the box. No issue with the 350. I guess I have a short in it. Anyone else having this issue? It was working fine...
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Old 02-28-2017, 04:25 PM
oklarado oklarado is offline
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Sorry for the problems... I had to do a double take looking at your list of cars in your signature.
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Old 02-28-2017, 04:45 PM
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Originally Posted by oklarado View Post
Sorry for the problems... I had to do a double take looking at your list of cars in your signature.
I have vehicular ADD. Still cheaper than having girlfriends on the side - that is how i justify to wifey.

Thinking about getting rid of the F-150. But I have about 10k into on top of the truck....
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Old 02-28-2017, 05:17 PM
Sleepyguy Sleepyguy is offline
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If you have a volt meter check the resistance of the cord and wiring. Also check the block heater plug. I think it's suppose to read 15 ohms
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Old 02-28-2017, 05:54 PM
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Originally Posted by Sleepyguy View Post
If you have a volt meter check the resistance of the cord and wiring. Also check the block heater plug. I think it's suppose to read 15 ohms
Thank you very much.
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Old 02-28-2017, 06:11 PM
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It might also be the power outlet has a lot on the curcuit to start with. Only way I know to test is to try a different one.

Buddy was ready to replace his block heater. We did some digging and found his cable he "repaired" was faulty.
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Old 02-28-2017, 11:42 PM
BII Plow Truck BII Plow Truck is offline
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Originally Posted by MisterScotty View Post
I am having a curious issue in that whatever I plug the engine block heater into via extension co0rd, it trips the GFI or the breaker in the box. No issue with the 350. I guess I have a short in it. Anyone else having this issue? It was working fine...
It's the GFI, replace it and all will be good. They wear out with use, and are especially sensitive in an outdoor / garage environment. I'm in the block heater business.
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Old 03-01-2017, 12:21 PM
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Be sure to use the shortest extension cord available with the lowest numerical wire gauge.
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Old 12-29-2017, 03:23 PM
cretelife77 cretelife77 is offline
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I've been having the same problem and about to take it to the dealer. It was working fine for 2 weeks until last week (truck is 2 months old)

Tried 3 different cords, went and bought a 12 gauge 25' cord, still blowing different breakers at house, cleaned plug with electronics cleaner and brush.

Took it to work, blew up 2 different breakers at work.

Showing 14.7ohms on multimeter. Dunno.
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Old 12-29-2017, 04:23 PM
rezneck rezneck is offline
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Just had this happen last night. Been about -25C for the past few nights and the truck starts fine, just thought I would plug it in. All my good extention cords are at camp, the one I had left was an old one and about 20 feet long. Will have to try a different cord and different plug in to see if one or the other is the problem.
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Old 12-29-2017, 05:43 PM
CRSFX4 CRSFX4 is offline
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If it is a 15 AMP circuit and you have other plugs drawing off that circuit, 10 AMPS could be enough to overload it. Try plugging a hair dryer (typically 15 AMP draw) into the same plug and see if it trips the breaker as well.
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Old 12-29-2017, 07:47 PM
dsladdict dsladdict is offline
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Quote:
Originally Posted by MisterScotty View Post
I am having a curious issue in that whatever I plug the engine block heater into via extension co0rd, it trips the GFI or the breaker in the box. No issue with the 350. I guess I have a short in it. Anyone else having this issue? It was working fine...
Take a look underneath your truck. Trace the wiring for the heater plug back into the frame. There is an amphenol(connector) that most likely has water in it. Pull it apart, dry it out real good, and use some dielectric grease around the seal and put is back together.
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Old 12-29-2017, 09:43 PM
bbronco66 bbronco66 is offline
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If I am not mistaken, doesn't Ford recommend using a 10 gauge cord no longer than ten feet?
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Old 12-29-2017, 10:44 PM
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Quote:
Originally Posted by BII Plow Truck
It's the GFI, replace it and all will be good. They wear out with use, and are especially sensitive in an outdoor / garage environment. I'm in the block heater business.
^^^ This. GFCI have their place but it's going to cause more trouble than their worth with block heaters. Just use a standard outlet and call it a day.
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Old 12-30-2017, 07:38 AM
dsladdict dsladdict is offline
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The heater draws roughly 1000 watts int a 120 volt circuit so about 8 to 9 amps. A 12 gauge extension cord is sufficient up to 100 foot assuming no more that 3% voltage drop....
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