BLOCK HEATER
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Junior User
Joined: Feb 2002
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From: michigan
BLOCK HEATER
I have an 00 7.3 with 190K on it, and am the second owner now having the truck for the 3rd winter. Never had issues starting until this year. I just finished reading 26 pages of, 1999-2003 7.3L diesel, fte guidellines, general information, tech links. in the stickies, and didn't see much concerning block heaters. My truck always started when the temps were low and not plugged in but you all know how much better it starts when it can be plugged it. I plugged mine in the other night when the temps were going to be in the single digits, and it would barely turn over.I crawled underneath and felt where the heater is and it was cold. I'm reading where these heaters don't go bad, can they be tested? how about the cord, does it just pull out of the heater. Yesterday I had the charger on for most of the day and today I'm going to see if it will start. Thanks in advance for any and all help..............Al
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The heater should be about 12-14 ohms. Test without cord plugged in. If you have infinite or much higher than 14 ohms resistance, replace the heater.
Unplug the cord and test flat prong to flat prong. Flat to flat should be infinite (no connection) if not plugged in. If you test the cord end to end, it should be 0 ohms resistance for each wire, and infinite between wires.
You may want to clean the flat blades of corrosion before testing.
Unplug the cord and test flat prong to flat prong. Flat to flat should be infinite (no connection) if not plugged in. If you test the cord end to end, it should be 0 ohms resistance for each wire, and infinite between wires.
You may want to clean the flat blades of corrosion before testing.
Logistics Pro
Joined: Dec 2010
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From: Temperance, MI
I just replaced my cord with one from orilleys for 22.75. The way I tested mine was replace it because I have no fancy electrical tools... It was cheap enough. I like the one from orilleys better anyways, it screws to the heater itself and isn't some janky weird thin metal clamp
Laughing Gas
Joined: Mar 2008
Posts: 967
Likes: 7
From: coquitlam,BC
I have an 00 7.3 with 190K on it, and am the second owner now having the truck for the 3rd winter. Never had issues starting until this year. I just finished reading 26 pages of, 1999-2003 7.3L diesel, fte guidellines, general information, tech links. in the stickies, and didn't see much concerning block heaters. My truck always started when the temps were low and not plugged in but you all know how much better it starts when it can be plugged it. I plugged mine in the other night when the temps were going to be in the single digits, and it would barely turn over.I crawled underneath and felt where the heater is and it was cold. I'm reading where these heaters don't go bad, can they be tested? how about the cord, does it just pull out of the heater. Yesterday I had the charger on for most of the day and today I'm going to see if it will start. Thanks in advance for any and all help..............Al
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Junior User
Joined: Feb 2002
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From: michigan
It's so nice to her that thing rumbling again. tappit01 and thomabb you both hit it right on the nose, the cord, at the plug, had a broken wire. I wouldn't have looked there as I had used it before it got this cold and it worked, oh well, it's running and hopefully I can get through the winter with it before I have to do some much needed changes.
These newer trucks are funny, I had an 84 F250 with a 6.9 international in it that would start everytime, unplugged, if the temps were above 0. Below 0, I needed the heater. This truck struggles at 25 will start unplugged but not any lower. Thanks to all that posted about different tips for curing this problem, I will keep your replys where I can get at them if needed.................Later, Al
These newer trucks are funny, I had an 84 F250 with a 6.9 international in it that would start everytime, unplugged, if the temps were above 0. Below 0, I needed the heater. This truck struggles at 25 will start unplugged but not any lower. Thanks to all that posted about different tips for curing this problem, I will keep your replys where I can get at them if needed.................Later, Al
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Joined: Nov 2006
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From: Fallon,NV & Bainbridge OH
Your truck should start sub zero without being plugged in, if it don't, you probably have a glow plug relay or glow plug issue. Mine started fine just last week at -20 without being plugged in.
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