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Block Heater Timer?

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Old 10-24-2007 | 08:38 AM
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The only thing about leaving it plugged in all night would probably be a higher energy bill and possible wearing out the heater early... Also, have heard of issues with block heaters/wiring that have caught vehicles on fires... But I don't know with modern GFCI requirements if it could happen.. I think I'll make a call to mythbusters and see if it can happen...
Old 10-24-2007 | 08:44 AM
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I remember reading that the timers would work fine for turning the heater on but allowing the timer to turn off was causing the failure of the timer.
Old 10-24-2007 | 08:45 AM
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Originally Posted by snoyes
The only thing about leaving it plugged in all night would probably be a higher energy bill and possible wearing out the heater early...
block heaters can fail but they really don't wear out. nothing to wear.

I second the Intermatic timer.
Old 10-24-2007 | 09:42 AM
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You may want to check your extension cord, make sure it is a good heavy duty with 3 prongs. If it's a light duty and 200 feet long it will draw more amp than needed and burn out your timer.

I have a $15, 15amp, cheap-o, from Wally Word, But it's plugged into a outside GFI 20 amp and a new heavy duty 25 ft cord, (well not new), it's been there for 4 years.
Old 10-24-2007 | 09:55 AM
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Originally Posted by cameroneod
I bought a gadget from Home Depot that kicks it on when the temperature is below 40.
This is interesting. More details please, manufactures name, price?
Old 10-24-2007 | 09:57 AM
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If you are plugging into a GCFI outlet, it is pretty easy to get it to trip if the plug at the truck builds up a little snow or ice. It tends to be a little warm at the plug and melts the snow/ice and will sometimes trip the safety.
Old 10-24-2007 | 11:29 AM
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Originally Posted by jkitterman
Is it just your one truck heater you are plugging in or is there more? The stock block heater doesn't pull anywhere close to 15 amp. They are rated between 650-750 watts.


Its just pluged into the truck w/ nothing else on the that circuit. Maybe that extra 25+ feet of cord laying there isn't helping?
Old 10-24-2007 | 11:31 AM
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Originally Posted by dale29
I would surely hook up the ground... the block heater pulls a good bit of power, go stand by your elect meter while its plugged in and have someone pull the plug you'll see!
I know, that why I use a timer. It doesn't need to be plugged in ALL night. Just 2 hours or so before I leave (depending on temp).
Old 10-24-2007 | 11:34 AM
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Originally Posted by cameroneod
I bought a gadget from Home Depot that kicks it on when the temperature is below 40.

40?! I don't plug mine in until its below 25. Ive never had a problem starting it though, Even after work when it was close to zero last winter. I'm sure that oil dont want to move when it that cold though!
Old 10-24-2007 | 11:36 AM
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Originally Posted by hivoltage
Your heater is 750 watts so it will draw 6.25 amps at 120 volts, if your heater is 650 watts it'll draw about 5.5 amps. Watts / volts = amps
Cool thanks, I often wondered what kind of watts it was pulling. I actually though it was over 1k since its heat related..
Old 10-24-2007 | 11:40 AM
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I have an Intermatic HB35R I bought at Wally World. It's 10 AMP and was $10. 3 prong plug and it's rain/sleet/snow tight as it has a cover. I've had it for 3 years with no problems.

That programable timer from Intermatic does look nice.
Old 10-24-2007 | 11:43 AM
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Originally Posted by RDM16CTD
I measured the block heater current draw on my 05 a couple of weeks ago - it was drawing about 6.5 amps and a little over 700 watts (AC voltage was showing 121). Any timer rated 15 amps should be plenty - I suppose there could be differences depending on model year, etc. but I doubt it could be more than double.

I have an X-10 Powerhouse system, so I can adjust the time easily from the control unit on the nightstand - I give it an hour at 30 degrees, 2 hours at 20, 3 hours at 10, etc. Engine starts fine.

I also use a winter front, to heat things up to operating temp more quickly.
!!More info on the "X-10" unit please. Sounds good!! I use the MOPAR winter front too. Thats one of the best $100 spent on this truck.

Last winter when the malmart timer crapped out I would get up like 2 hours early and run out in 15 degree weather in my boxers just to plug the extension cord in!! NOT FUN. I wish it would fit in my garage but the trucks too tall, even at OEM height .
Old 10-24-2007 | 11:50 AM
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Originally Posted by AlCorr
You may want to check your extension cord, make sure it is a good heavy duty with 3 prongs. If it's a light duty and 200 feet long it will draw more amp than needed and burn out your timer.

I have a $15, 15amp, cheap-o, from Wally Word, But it's plugged into a outside GFI 20 amp and a new heavy duty 25 ft cord, (well not new), it's been there for 4 years.
The Cord I'm using is a nice outdoor HD 3 wire and only 25 feet long. I have a 12 or 15' version too which I may try this winter depending on how I park..
Old 10-24-2007 | 11:54 AM
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Originally Posted by jkitterman
If you are plugging into a GCFI outlet, it is pretty easy to get it to trip if the plug at the truck builds up a little snow or ice. It tends to be a little warm at the plug and melts the snow/ice and will sometimes trip the safety.
No GFI outlet but it is inside the garage where the timer was, I just ran the cord under the garage door-

The fiitting on the truck is an actuall Marine type 120VAC unit mounted to the ranchhand and had a integreated rubber cap for wheather. Pretty sweet setup and it always right there.. Looks oem too-
Old 10-24-2007 | 12:02 PM
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Originally Posted by Buddy7311
I remember reading that the timers would work fine for turning the heater on but allowing the timer to turn off was causing the failure of the timer.
That may be too, But I always unplugged it from the truck end before the timer actually kicked off. The two timers I had worked a dozen or so times before I realized it wasn't getting juice to the heater any longer.


I see Home depot in my crystal ball for staurday



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