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Farmall & IHC Tractors Discussion Forum
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Glow Plug voltage

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Sonny in VA

01-16-2005 08:35:25




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Recently got to helping a friend with a project on an IH B-414. Going to try re-wiring everything on the engine for him. What voltage do glow plugs run at? The Champion CH-28's that are in it say .9 volt!!! is this correct, and if so how do you reduce the voltage from 12 to .9 volts???




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JB2

01-16-2005 14:02:10




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 Re: Glow Plug voltage in reply to Sonny in VA, 01-16-2005 08:35:25  
Hi, the glow plugs on a B414 are wired in series.

So there is 4 glow plugs + the indicator coil = 5 elements.

12Volts divided by 5 elements = approx. 2.5 Volts/element.

Whith voltage drop in the switch and the wiring the voltage at the glow plug is probably 0.9 volts.

The bad thing about these glow plugs if one burns out they all stop working and if one shorts it blows out the one next to it.

Good luck
JB2

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The Red Barron

01-16-2005 18:56:22




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 Re: Glow Plug voltage in reply to JB2, 01-16-2005 14:02:10  
While I do not possess a B414 I have owned several diesel vehicles in the past and am familiar with glow plugs and their wiring, as well as being a professional electrician. If this is wired the same way that my past vehicles have been then the glow plugs are NOT wired in series. To do so would require that the next glow plug in line would have to be passing all the current of the previous one and that any single glow plug failure in the chain would render the entire chain an ineffective open circuit. While the common bussing feeding the tops of the glow plugs is in fact common, the return path for the current passing through each individual glow plug passes through the threads screwing the plug into the engine block in the same way that a spark plug passes current. They are in fact in parallel. Thus dividing the resistances of the four plug plus the indicator coil is not going to give you the voltage per device. While I am not familiar with B414 glow plugs I would be astonished to find that they did not operate on the same principle as those I am familiar with.
How they are operating at .9 volts seems dubious and a complete mystery to me though some quick meter checks could verify such a thing. Simply remove the bussing from the last glow plug in the chain (assuming it is still a good one) and connect the top of the plug to the bussing through a volt meter set on a DC Amp setting to obtain the actual AMPERAGE. (This is of course with the glow plug circuit activated as if you were trying to heat the glow plugs to start your tractor) As to obtaining the VOLTAGE you simply place one lead on top of the plug (again as if trying to heat up the glow plugs before starting) with all the bussing intact like normal and the other lead to ground. Whatever voltage is getting to the plug top electrode is going to be the same as what the meter reads.

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Scout1

01-22-2006 11:37:49




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 Re: Glow Plug voltage in reply to The Red Barron, 01-16-2005 18:56:22  
The B414 is in series like christmas tree lights.
When one goes out they all quit working until you track down the burnt one. In a nutshell battery to switch to resistor to #4 gp heavy copper wire run from #4 to #1 with a ground from #1 to water pump.(positive ground system).
Now I have a question. I replaced the starter for one with the solonoid on it and took the ford style switch off, I also put an alternator with a built in regulator on it, and took off old regulator. It had a one 12volt battery system on it when I purchased it, so if I use the basic glow plug set up already on there I will be running a positive to the #4 gp and a positive ground from the #1gp(causing resistor melt down). How do I ground the system from a negative ground standpoint with this set up?

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Sonny in VA

01-16-2005 15:55:18




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 Re: Glow Plug voltage in reply to JB2, 01-16-2005 14:02:10  
Is there a way to wire up the glow plugs without the switch???



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P Backus

01-16-2005 11:29:32




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 Re: Glow Plug voltage in reply to Sonny in VA, 01-16-2005 08:35:25  
I don't know that specific tractor, but I know that on some of my equipment, they intentionally use lower voltage glow plugs with a 12 volt system so that the glow plugs warm up faster and provide a faster start. It seems like they would burn out, but they don't. I suppose part of the reasoning is that when the glow plugs are engaged, the system voltage drops below 12V anyway. My 12V Navistar diesel has used 6V glow plugs from the factory, and they rarely go bad. No attempt is made to reduce the voltage to the glow plug.
Paul

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Sonny in VA

01-16-2005 13:34:17




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 Re: Glow Plug voltage in reply to P Backus, 01-16-2005 11:29:32  
I noticed the glow plugs are marked .9 volts, that's why I was wondering about reducing the voltage...



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