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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 01-03-2008, 04:34 PM   #1 (permalink)
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block heater

how much power does the block heater draw?

and does it cycle or keep heating like if i leave it on for a few days will it keep heating or does it cycle to a certain temp range?
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Old 01-03-2008, 04:54 PM   #2 (permalink)
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Re: block heater

Use a heavy duty clock timer, one that will work with a home AC unit, 15Amps. It stays on as long as it's plugged in.
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Old 01-03-2008, 04:59 PM   #3 (permalink)
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Re: block heater

its either 1350 watts, or 1500----dont remember which
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Old 01-03-2008, 05:47 PM   #4 (permalink)
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Re: block heater

ok thanks guys
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other mods, oba, warn winch, big steel goodies including a headache rack etc.

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Old 01-03-2008, 06:55 PM   #5 (permalink)
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Re: block heater

I thought it was 1200W...?? Who knows. Divide wattage by 120V...10A.
I do know that it wouldn't be as high as 1500W. That would be tripping alot of people's breakers by drawing 15A for long periods.
Also- it is constantly on no matter what.
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Old 01-04-2008, 04:02 AM   #6 (permalink)
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Re: block heater

I actually thought it was 1000 watts. Regardless, as long as it's plugged in, it's heating. No thermostat or cycling. As stated above, you can put a timer on it to come on before you intend to drive it. I did this once until I fixed my glowplugs. 2 hours heating prior to starting is plenty. Plus it's nice to have instant heat out of the heater (inside the cab).
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Old 01-07-2008, 12:36 AM   #7 (permalink)
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Re: block heater

Well folks, if ya want something heavy duty, I found this online:

http://www.surpluscenter.com/item.as...8-125&catname=

Item number: 11-3148-125
Listed for: 19.95

25 amps, 3125 Watts.

All you would have to do is buy a short extension cord and hack it in half and connect it. The list having 420 in stock. I thought about getting a few for my farm tractors (the ones I might use in the morning, stager warm them so I don't trip the breaker.
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Old 01-07-2008, 01:15 AM   #8 (permalink)
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Re: block heater

Good find Kaliburz. I might have to order one of those.
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Old 01-07-2008, 08:19 AM   #9 (permalink)
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Re: block heater

Mine draws 7.2 amps constantly.
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Old 01-07-2008, 12:41 PM   #10 (permalink)
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Re: block heater

cloutierthedj- good to see another member from Indiana on board. There seems to be alot of us. Where are you from, if you don't mind me asking?
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Old 01-08-2008, 12:10 AM   #11 (permalink)
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Re: block heater

Got my outdoor timer at Home Depot, $18.00. I give it 2-3 hrs. before I go to work.
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Old 01-08-2008, 12:52 PM   #12 (permalink)
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Re: block heater

I found a gizmo that plugs in between the heater cord and the extension cord that turns on a 34 degrees and turns off at 45 degrees. Sure is sucks electricity when "on" but since I'm having rad leaks and haven't gotten a 'round tuit' and am just using straight water, a higher electric bill is better than a busted block. I had arortic aneurism surgery Dec. 3rd and can't lift that damn rad out to get 'er fixed AGAIN. It's been hard enough just cutting up all the dang trees and branches that fell during the ice storm three days after I got home from hospital. OkieGringo
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Old 01-09-2008, 02:27 AM   #13 (permalink)
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Re: block heater

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: OkieGringo</div><div class="ubbcode-body">I found a gizmo that plugs in between the heater cord and the extension cord that turns on a 34 degrees and turns off at 45 degrees. Sure is sucks electricity when "on" but since I'm having rad leaks and haven't gotten a 'round tuit' and am just using straight water, a higher electric bill is better than a busted block. I had arortic aneurism surgery Dec. 3rd and can't lift that damn rad out to get 'er fixed AGAIN. It's been hard enough just cutting up all the dang trees and branches that fell during the ice storm three days after I got home from hospital. OkieGringo </div></div>

I had one of those too, for my tractors long time ago. I'm not sure what it was rated, but I think I destroyed mine quick. Air temp showed like 28F and the thing still wouldn't turn on. Thought it was block heater, so I by passed that temp device.... heater started right up. I think it might have worked once or twice before it went TU.

I even tried some of those conventional timers, slide the on/off for time. But I think they were not high enough in rating. I destroyed one of those also. At the time, I think I only found a 15amp one (1800/1825 watt). It would turn, but when it got to the spot to 'turn on', just wasn't enough 'uph' to turn. [img]/forums/images/%%GRAEMLIN_URL%%/confused.gif[/img]
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1981 VW Rabbit Pickup 1.6L diesel (project)
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Old 01-09-2008, 07:38 AM   #14 (permalink)
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Re: block heater

I had a bad head gasket and was running water for a few weeks in winter. Added some water every morning. Keeping it plugged in will keep the block from freezing, but the heater core won't be protected. Had to bypass the split heater core and drive around with no heat until I got a another truck.
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Old 01-09-2008, 10:11 AM   #15 (permalink)
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Re: block heater

Never just use water......always use coolant with at least the minimum requirement for your area/time of year. $10 a week the weakest strength of A/F is way cheaper than a $400 RAD.
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