Why two batteries
Freshman User
Joined: Sep 2005
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From: Washington St
Originally Posted by cookie88
How do you run a 115vac heater off a 12vdc battery?
Freshman User
Joined: Sep 2005
Posts: 38
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From: Washington St
Originally Posted by SpringerPop
The glow plugs are 12 volt heaters, not 115.
Pop
Pop
Anyone with a Chiltons, Haynes or Ford service book can look that up for you.
Post Fiend
Joined: Sep 2003
Posts: 6,096
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From: Mesa AZ
Originally Posted by TrvlnP8
Injectors on the 7.3L draw very little power, it takes almost nothing to signal the injector and to return the signal to the control module, oil pressure does the work. .......
I am just guessing about the amps the IDM require. All I know is when my batteries went bad.....my engine cranked and cranked like nobody's business, just like a gas engine would if the spark plugs were removed. So I know the compression isn't all that hard on the starter, the engine did not fire because there was no fuel getting in the cylinders because there was not sufficient voltage to operate the injectors. Connect up a jump start, and the truck fired right over....no black smoke, no excess fuel out the tail pipe. If the injectors were operating, there would have been a major cloud coming out my tail pipe when the engine finally started.
Last edited by Shake-N-Bake; Sep 29, 2005 at 10:53 PM.
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Freshman User
Joined: Sep 2005
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From: Washington St
Originally Posted by SpringerPop
And what "module" on our trucks is responsible for doing this trick?
The only 115 volt heating element on our trucks is the block heater.
Pop
The only 115 volt heating element on our trucks is the block heater.
Pop
The 115v DC is provided by a voltage regulator.
Hotshot
Joined: Jan 2002
Posts: 17,988
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From: La La Land
Yup. The block heater is run from shore power. But the fact still remains that the only heating element on our trucks that is 115 volts is the block heater. The glow plugs are 12 volts. Incidentally, the block heater COULD be powered by 115 volts DC just as well, as it is strictly a resistive load.
And that "voltage regulator" would be located where?
Pop
And that "voltage regulator" would be located where?
Pop
Last edited by SpringerPop; Sep 29, 2005 at 11:22 PM.
Freshman User
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From: Washington St
[QUOTE=gchavez]Partially correct. Oil pressure does drive the fuel injector via the IDM (Injector Driver Module) which sends a 110 volt pulse-width modulated signal to the injector solenoid. 110volts is made available to the IDM via step up transformer (for lack of a better term). All transformers take volts to create amps or vice versa. In this case, we have 12volts at the battery yet need 110 volts at the IDM. Assuming the IDM needs about 6 amps to operate the solenoids.....the battery needs about 550 amps to fire the injectors plus whatever is needed to turn over the starter.
QUOTE]
We have a little bit better conversion than that, because it is 110-115v DC, less amps lost in the conversion. But essentially you are correct, I'm sorry if it sounded like I meant the injectors were negligable, they do have a draw, but then we also use electricity for fuel pump and when you start to add all that up... it adds up to the same thing, we need 2 batteries!
QUOTE]
We have a little bit better conversion than that, because it is 110-115v DC, less amps lost in the conversion. But essentially you are correct, I'm sorry if it sounded like I meant the injectors were negligable, they do have a draw, but then we also use electricity for fuel pump and when you start to add all that up... it adds up to the same thing, we need 2 batteries!
FTE Leadership Emeritus
Joined: May 2001
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From: Cabot, Arkansas
I looked it up myself in my Ford Factory service manual. The Glow plug system on the Powerstroke diesel is entirely 12 volts. There is no voltage regulator, no diodes, no resistors. Only the batterys, the relay and the powertrain control module, except for california trucks and Excursions, which emply a glow plug control module....wich is also a 12 volt system.
Freshman User
Joined: Sep 2005
Posts: 38
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From: Washington St
Originally Posted by cookie88
I looked it up myself in my Ford Factory service manual. The Glow plug system on the Powerstroke diesel is entirely 12 volts. There is no voltage regulator, no diodes, no resistors. Only the batterys, the relay and the powertrain control module, except for california trucks and Excursions, which emply a glow plug control module....wich is also a 12 volt system.