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Farmall & IHC Tractors Discussion Forum
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Re: D236 Glow plugs

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Chris Brown

11-07-2004 08:35:20




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On my 560 the glow plugs draw alot of current but nothing like a dead short,I'm no electronics expert but theres a resistance factor there somewhere. If it were a dead short into the glow plug it would simply burn the wire right off it the first time power was applied. Normally when a glow plug goes bad it burns out to an open circuit. I suggested that maybe/possibly one had burned out and caused a short circuit,although very unlikely. It is a whole lot easier to explain something in person than typing it out.

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Allan in NE

11-07-2004 09:28:00




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 Re: D236 Glow plugs in reply to Chris Brown, 11-07-2004 08:35:20  
Hi Chris,

Yes, I knew what you meant and you're right; they have a small amount of resistance (kinda like a carbon filled plug wire) and they usually fail "open".

That's the trouble with these darned computers anyway....can't see the "emotion" of the sentence. :>)

Allan



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old don

11-07-2004 16:10:37




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 Re: D236 Glow plugs in reply to Allan in NE, 11-07-2004 09:28:00  
I don't know that much about glow plugs but electricity is after all electricity using Ohm's law if you have a multimeter with DC amp capability you can hook it it up inline better known as series connection and make sure you have it in the right range and operate it as normal and see what your amp reading is and then determine if your wire is heavy enough to handle the load and as someone said in an earlier post those glow plugs should have a resistance value in a spec book somewhere. Basically if you know what the resistance is of one then multiply that by six or whatever total amount in a series and with a known voltage ie; 6 or 12 by using Ohms law can determine the amp reading. My opinion is if you have a glow plug that has a high resistance it could cause problems. A multimeter set on Ohms could find the problem if you unhook each one and take a reading on each one writing them down and if one is higher than anyother by more than 10% it could have a problem.

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