Block heater how long - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 01-04-2012, 08:23 PM   #1 (permalink)
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Block heater how long

I have a 2000 f-350 good ole 7.3 I plug my heater up around 9pm when I need to and unplug around 6:30 am when I go to work. Am I leaving it on to long can I hurt anything besides my electric bill should I put it on a timer if so what 4 hrs or so thanks for any opinions


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Old 01-04-2012, 08:29 PM   #2 (permalink)
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Yeah, your wasting electricity. These heaters use 1000 watts. 2-3 hours is plenty.
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Old 01-04-2012, 09:51 PM   #3 (permalink)
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I only need to plug mine in for about an hour when it gets to zero. So that long is too long. Don't spend your $$ on electricity. Spend it on fixing the problem. I see you live in Tenn. I'm sure it doesn't get that cold down there for long periods of time. It should start without being plugged in down to 20-25 degrees at least. Start with the Glow plug relay.
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Old 01-04-2012, 09:56 PM   #4 (permalink)
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Is it possible for the block heater to blow a 15 amp house fuse?
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Old 01-04-2012, 09:59 PM   #5 (permalink)
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yes I believe so. I think it's 20a and 1000w
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Old 01-04-2012, 10:02 PM   #6 (permalink)
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Is it possible for the block heater to blow a 15 amp house fuse?
It's possible. First thing there is to figure out what else is on that circuit because the block heater might push that breaker to trip if it's already close to being overloaded.
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Old 01-04-2012, 10:45 PM   #7 (permalink)
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It has the Master bed and bath plus an old freezer, fridge and washing machine. Last night an outlet only went out that had the fridge, freezer, washing machine, block heater, small deepfryer. Same outlet had just powered half the Christmas lights and has been running all those for the last four years. I'm thinking the old fridge is toast, the old freezer is toast or the block heater, just not sure how to figure out which one.
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Old 01-04-2012, 10:59 PM   #8 (permalink)
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It has the Master bed and bath plus an old freezer, fridge and washing machine. Last night an outlet only went out that had the fridge, freezer, washing machine, block heater, small deepfryer. Same outlet had just powered half the Christmas lights and has been running all those for the last four years. I'm thinking the old fridge is toast, the old freezer is toast or the block heater, just not sure how to figure out which one.
Way too much on one breaker. Find one with way less on it.
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Old 01-04-2012, 11:26 PM   #9 (permalink)
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Way too much on one breaker. Find one with way less on it.
I agree. The block heater draws just over 8 amps, so it's already taking more than half the capacity of that 15A breaker, and refrigerators draw a bunch of amps when they're starting up.
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Old 01-05-2012, 12:12 PM   #10 (permalink)
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Good I information guys so tell me this when you start your truck and switch is on someone told me one time your glow plugs stayed on for 2 min cycles I probably need glow plugs mine is hard to start when it is in the 20s any help would be appreciated


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Old 01-05-2012, 12:43 PM   #11 (permalink)
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Good I information guys so tell me this when you start your truck and switch is on someone told me one time your glow plugs stayed on for 2 min cycles I probably need glow plugs mine is hard to start when it is in the 20s any help would be appreciated
Check the Hard/No Start link in my signature for how to check out your GP system.

Yes, the GP's do stay on for up to 2 minutes, based on oil temperature. On the pickups, if the oil temp is above 180, they don't come on at all. At around 80F, they are on for about 1 minute, and below about 20F they are on for 2 minutes. The Wait to Start light is independent from glow plug operation and is on for between 1 and 10 seconds after key-on.
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