DIY Glow plug timer circuit

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boss
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Joined: Fri Jun 02, 2006 12:56 pm
Location: NE New Mexico

DIY Glow plug timer circuit

Postby boss » Sat Sep 22, 2007 8:31 am

I just got done building the glow plug timer circuit for a client's 1984 Blazer. It works like a dream. I employed the original relays and glow plug lights, but the actual controller someone by-passed, which led to the quick destruction of the glow plugs. With the use of one general purpose transistor (ECG 210) two resistors and one capacitor used as the discharge controller, the relay stays on for 9 seconds precisely, after pressing the momentary contact button.
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I modified this circuit to make it hold the relay on for 9 seconds. I ditched the diode, and the Darlington pair transistors in favor of a single NPN ECG 210. The button is in between the 12volt supply and (I switched the 47k ohm with a 33k ohm resistor.) I used a 10k resistor is instead a 47k
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This is Jerry's diagram of how the Isuzu can be modified
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This diagram was found on a Mitsubishi Pajero forum, Shows very well how the glow plug circuit is supposed to work. However this uses a 555 timer chip and I wanted a simpler circuit. Mine has 4 parts.
I hope you find this helpful.
Thanks go out to Jerry Lemond for his input.
Brian Rodgers
Last edited by boss on Sat Sep 22, 2007 8:47 am, edited 2 times in total.
Brian Rodgers
Pup(gasser),used engine in! Seems great!
Two 1986 Isuzu Troopers C223T engines (1 good -1 bad)
my web site http://outfitnm.com/ biodiesel, axial flux wind turbine, no worries, no ads

fconnaly
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Joined: Thu Feb 08, 2007 10:58 pm
Location: Roanoke Texas

Re: DIY Glow plug timer circuit

Postby fconnaly » Sat Sep 22, 2007 8:42 am

DID YOU TIE IT INTO JERRY`S DIAGRAM OR DOES IT BYPASS HIS SYSTEM? ALITTLE MORE DETAIL ON HOW YOU HOOKED IT UP FOR US OLD FOLKS WOULD BE APPRECIATED.
Last edited by fconnaly on Sat Sep 22, 2007 12:42 pm, edited 1 time in total.
1994 Isuzu Pickup 2.3l engine 2wd currently 99 percent finished converting to diesel adding 3" body lift done,Power steering finished ,and grease.too busy to finish it (i.e too lazy)

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boss
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Posts: 209
Joined: Fri Jun 02, 2006 12:56 pm
Location: NE New Mexico

Re: DIY Glow plug timer circuit

Postby boss » Sat Sep 22, 2007 9:00 am

I guess I should have posted this in the proper section, maybe Jack will move this over to the "Mods" section.
fconnaly wrote:
DID YOU TIE IT INTO JERRY`S DIAGRAM OR DOES IT BYPASS HIS SYSTEM? ALITTLE MORE DETAIL ON HOW YOU HOOKED IT UP FOR US OLD FOLKS WOULD NE APPRECIATED.
Watch out now, you are talking to a senior citizen too.
Now what was the question? Oh yeah I just pasted it above...
This particular circuit went into a 1984 Blazer. So yeah, I used Jerry's diagram for reference, to understand how glow plug circuits in general worked.
However this timer can be insinuated in any glow plug circuit before the manual relay. If you suspect the glow plugs are being left on too long and burning out prematurely.
At least I think it will work in there. Let me look at Jerry's drawing again...
I don't know... This drawing shows a circuit which is activated by the starter relay, with this the timer will be powered constantly instead of momentarily. It would stay on for 9 seconds after the power is removed.
This doesn't mean we couldn't work around this issue.
Brian Rodgers
Brian Rodgers
Pup(gasser),used engine in! Seems great!
Two 1986 Isuzu Troopers C223T engines (1 good -1 bad)
my web site http://outfitnm.com/ biodiesel, axial flux wind turbine, no worries, no ads


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