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Troubleshooting block heater

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Old Jan 12, 2014 | 02:14 PM
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Troubleshooting block heater

Hi all,
Plugged in the other night, starts smoking. Checked ohms from plug to heater, showing 18. I am guessing that isn't enough, and can't find specs anywhere. This is going through the two flat terminals, so thinking the element is shorting? Thoughts?

Thanks.
 
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Old Jan 12, 2014 | 02:36 PM
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Somewhere in the neighborhood of 15 ohms is normal. You're not far off. Do you mean the truck was smoking after you started it, or something else started smoking when you plugged the block heater in?
 
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Old Jan 12, 2014 | 02:48 PM
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A 1000 watt heater should draw about 9 amps. If you use Ohm's law, to calculate resistance, you should have somewhere near 12 ohms. I would bet your cord is bad.
 
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Old Jan 12, 2014 | 02:55 PM
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At standard household 120 VAC, 1000 watts is 8.33 amps, so 14.4 ohms would be expected, absent any additional resistance in the cord, connections, etc.
 
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Old Jan 12, 2014 | 04:09 PM
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lhud
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Pickachu is correct for 1000 watts. If it were a 900 watt heater the ohms would equal 16.
 
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Old Jan 12, 2014 | 04:14 PM
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14 comes to mind as I researched this a while ago. I ended up replacing my cord and all is better.
 
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Old Jan 12, 2014 | 04:31 PM
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Originally Posted by Pikachu
Somewhere in the neighborhood of 15 ohms is normal. You're not far off. Do you mean the truck was smoking after you started it, or something else started smoking when you plugged the block heater in?
Great stuff. The cord/connection started smoking, and a frying noise.
 
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Old Jan 12, 2014 | 04:42 PM
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You can either cut the end off and replace it with a new end, or replace the entire cord assembly. You could also install a weatherproof marine type connector with the gasketed spring-flap thingy . . .
 
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Old Jan 13, 2014 | 10:23 AM
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I bypassed my Marinco to be sure, it's the cord or element. I just ordered the cord and new element from Tousely, now White Bear? But they still have great internet pricing.
78 bucks plus shipping. Not real cold this week, so a good time to get it done and not worry about that part.
Now for the rest of my 225k mile/13 year old truck!

Thanks for the replies.
 
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Old Jan 13, 2014 | 11:59 AM
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Marinco. That's the word I was struggling to remember. Getting older is so much fun : (
 
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Old Jan 22, 2014 | 12:58 PM
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Fixed. New cord and element, figured it is easy enough to replace, it was. Directions, which were pretty worthless, said 29mm for the element, inch and 1/8 worked fine.
16 ohms through Marinco, old element was good, so I have a spare.
Since we always like to pick on where parts come from, the package says contents made in USA, there is a tag on the harness "Made in China"? Who knows.
PN for the kit is: 1C3Z-6D008-AA.
 
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Old Jan 22, 2014 | 01:09 PM
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It's probably just the package that was made in the USA
 
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Old Jan 23, 2014 | 10:35 AM
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From: George West, Texas....
OK a question ..
Where is the heating element located and does anything else need to come off to replace it ?
I'd go out and crawl around and look for it but the north wind is howling and it's cold out side, plus I just had my right hip replaced so I don't know if crawling around under my truck is such a good idea, not right now anyway.
Thanks
 
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Old Jan 23, 2014 | 12:04 PM
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Originally Posted by RobertJohn
OK a question ..
Where is the heating element located and does anything else need to come off to replace it ?
I'd go out and crawl around and look for it but the north wind is howling and it's cold out side, plus I just had my right hip replaced so I don't know if crawling around under my truck is such a good idea, not right now anyway.
Thanks
The element is just above the oil filter, an orange plug into it. Large 1 1/8" hex. Should be able to remove without taking more stuff off, but you will loose some coolant.
 
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Old Jan 23, 2014 | 12:25 PM
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The elements don't go bad too often. It is almost always the cord. And if you get it from International, it is cheaper.
 
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