Block Heater on my 99.5 7.3 blows the house fuse? - Diesel Forum - TheDieselStop.com
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Old 10-10-2012, 09:19 PM   #1 (permalink)
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Question Block Heater on my 99.5 7.3 blows the house fuse?

Hey guys, Everytime I plug in my engine block heater on my 1999.5 7.3 F250 its fine in the beginning then it blows the circuit breaker fuse on the electric box in my house.The same thing happens at my job with the fuse blowning and needing to be reset.Now I am using a heavyduty extention cord and I tried 3 different extention cords.I know I can just go and buy a new engine heater block set up but I figured I ask here first if there is something simple to fix or look for before spending the cash that I dont have on a new one.I'm thinking there must be a short circuit happening.I want to try and get this working before winter really sets in.And also yes it was doing this before I installed the 2012 nose so it's not from the new nose installation.Thanks for any ideas or info.

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Old 10-10-2012, 09:34 PM   #2 (permalink)
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Could the cord have been cut or pinched while you were doing your project?
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Old 10-10-2012, 09:48 PM   #3 (permalink)
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The block heater is actually only two parts, the cord and the heating element itself. :shrug:


Not much to it. I don't know if I would even troubleshoot it. They're 70 bucks on ebay. You could just buy the cord by itself too for half that.

But, if you've got a meter, just disconnect the cord from the heater element and ohm out the cord and then the heating element by itself.

Though, if the problem is the cord, you might need a megger, not a regular ohm meter.
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Check your wiring harness: Chaffed wiring at driver's valve cover.

Keep everyone (and yourself) updated:7.3 mileage and repair thread

If you insist on throwing parts at your truck to fix the problem, go big--don't forget the driver's side frame rail.

If your ICP connector has oil in it, change it. Don't argue, just change it. Don't check other things first, just change it.
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Old 10-10-2012, 10:24 PM   #4 (permalink)
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ok thanks guys I'll check the cord tomorrow.
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Old 10-10-2012, 10:41 PM   #5 (permalink)
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ok thanks guys I'll check the cord tomorrow.
I had that happen with mine a couple years ago and I finally found the cord had frayed further in (it was hard to find), but was shorting out from it. I cut the cord back to the short and spliced in the male end from an older heavy duty extension cord. It's worked perfectly ever since.
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Old 10-10-2012, 10:48 PM   #6 (permalink)
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I had that happen with mine a couple years ago and I finally found the cord had frayed further in (it was hard to find), but was shorting out from it. I cut the cord back to the short and spliced in the male end from an older heavy duty extension cord. It's worked perfectly ever since.
I'll try what you did first before I buy a new one.What do you think cause it? the exhaust manifold? dry rot? rubbing?
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Old 10-11-2012, 01:32 AM   #7 (permalink)
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I'll try what you did first before I buy a new one.What do you think cause it? the exhaust manifold? dry rot? rubbing?
Just rubbing. And mine is an '05, so it really happened after 6 years. I had a friend with an '03 that had the exact same issue and basically did the same fix. Good luck.
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Old 10-11-2012, 02:06 AM   #8 (permalink)
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Just rubbing. And mine is an '05, so it really happened after 6 years. I had a friend with an '03 that had the exact same issue and basically did the same fix. Good luck.
Thanks again guys,I will try everything you adviced. I heard its gonna be a wild winter up here in the north east this year so I just wanna be ready.Thanks alot..
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Old 10-11-2012, 06:01 PM   #9 (permalink)
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What usually kills the cord for the block heater is allowing the plug in the grill or front bumper area to flop around in the breeze. After you get it repaired this time, you want to find a good strong place and tie it up very tightly so it cannot flop around. Or better yet, replace the stock plug on your block heater cord with a Marinco plug, then install that Marinco plug into the front of the truck per the following link:
TheDieselStop.Com - Marinco Plug Mod

If you don't believe in doing anything half-way, then instead of a Marinco plug, spend the big bucks for a Kussmaul Super Ejector plug. Then when you forget to unplug the block heater before you go driving down the road, the ejector will save your bacon. The ejector plugs are used by fire departments because the firemen don't have time to be piddling with an extension cord when the bell goes off.
Kussmaul Electronics Super Auto Eject, 120 Vac, 15 Amp
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Old 10-17-2012, 10:21 PM   #10 (permalink)
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Originally Posted by SmokeyWren View Post
What usually kills the cord for the block heater is allowing the plug in the grill or front bumper area to flop around in the breeze. After you get it repaired this time, you want to find a good strong place and tie it up very tightly so it cannot flop around. Or better yet, replace the stock plug on your block heater cord with a Marinco plug, then install that Marinco plug into the front of the truck per the following link:
TheDieselStop.Com - Marinco Plug Mod

If you don't believe in doing anything half-way, then instead of a Marinco plug, spend the big bucks for a Kussmaul Super Ejector plug. Then when you forget to unplug the block heater before you go driving down the road, the ejector will save your bacon. The ejector plugs are used by fire departments because the firemen don't have time to be piddling with an extension cord when the bell goes off.
Kussmaul Electronics Super Auto Eject, 120 Vac, 15 Amp
I did buy a marinco plug but I'm not sure where I want to mount it.
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