6 Volt glow plug vs. 12 Volt

Scott z · Aug 6, 2014

I have a IH B275. I believe it has been upgraded to the 12 volt system. It has 1 - 12 volt battery opposed to 2 - 6 volts batteries that were standard for those tractors when they were new. My problem is I"m going through glow plugs and I don"t think things are working correctly electronically. I"ve been ordering part #710348R2 when I"ve been replacing glow plugs. Is that plug only rated for 6 volts? I have 12 volts going to the plugs per the amp meter. I"m starting to think I need different plugs that can handle 12 volts? Also, the tractor plugs are wire in paralell instead of in-series. Any information will help!

mkirsch · Aug 6, 2014

According to the wiring diagram in the parts book at partstore.caseih.com, the two 6 Volt batteries would be wired in series to make a 12 Volt system.

It also shows the four glow plugs wired in series:

http://partstore.caseih.com/us/LambWebsterNorthJava/parts-search.html#epc::mr52552ar254630

mkirsch · Aug 6, 2014

Sorry, I am mistaken. They are wired in parallel. That is the only way they can be wired, as they only have one terminal.

Is it possible that the resistor, part #33 is no longer resisting?

Scott z · Aug 6, 2014

The resistor still gets hot / red. If it is resisiting correctly, how many volts should be at the plug past the resistor?

If you look at the attached link and the pictures. It is currently wired as "bosch 12 volts wired in paralell" but with the old style glow plug, not the updated 12 volt bosch plug.

I forgot to thank you for your response.
Untitled URL Link

mkirsch · Aug 7, 2014

Hmm. Sorry I don't know the exact answers here. I'm just working off basic electrical principles and what I can observe, exactly how I would be doing it if the tractor were in my shop.

Looking at the original style glow plugs, it appears that there are TWO electrical connections, terminals, on them. One above the pink washer, and one below the pink washer.

If you have those wired up like the updated plugs, in parallel, it's no wonder you are burning plugs out. You need to wire them in series.

Looks like it should be, using the picture of the engine, and the wiring diagram from the parts book:
1. From the resistor to above the pink washer on #1
2. From below the pink washer on #1 to above the pink washer on #2.
3. From below the pink washer on #2 to above the pink washer on #3.
4. From below the pink washer on #3 to above the pink washer on #4.
5. From below the pink washer on #4 to the engine block.

Someone must have installed the updated 12V glow plugs at one time, and you've replaced them with the OEM plugs.

OEM plugs are rated for .9V (9/10 Volt per the picture in the other thread). If you pump 12V through them... PIFF!

6 Volt glow plug vs. 12 Volt

Scott z

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mkirsch

Well-known Member

mkirsch

Well-known Member

Scott z

New User

mkirsch

Well-known Member

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