1960 McCormick International B275 Glow plugs

Today I replaced the glow plugs in my tractor. They didn't work when I was finished. I checked my work and found nothing wrong. I had taken pictures beforehand and during the removal of the old glow plugs.
The dash indicator wouldn't turn red or even get warm to the touch.
The manual doesn't hit on glow plugs at all. A youtube video was a lot of help but still no glow plugs working.
The old ones did work then slowly went away until they no longer worked which is why I got new ones.
Going to tear the dash apart and see if I got power. There is a fuse holder that's all corroded. The lights don't work now. Is the glow plugs affected by this fuse or does it only run the lights?
Any help would be appreciated since I'm pretty much in the dark about this tractor. It does run good though.

The glow plugs are in SERIES, so one bad connection means none will work.

Dunno WHY you want to tear the dash apart until you grab a simple test light and see where the voltage disappears???

I DOUBT the lite fuse has anything to do with the G.P's.

I don't have a B-275 wiring diagram at hand, but the link below is to a diagram of it's younger sibling, the 424, which may or may not be similar.
424 wiring, look at Page 3

Thanks.
I'll do the voltage check. I was running out of daylight this afternoon.
I cleaned the wires and contacts with a Dremel tool and a wire brush.
I noticed when I was installing them that two had brass collars under the insulators and two were steel. Is this significant? I just put them in and didn't notice the collars until I was putting the wires on.

"two had brass collars under the insulators and two were steel"

Must have been a change over time, or maybe with replacement GP's, either should work if clean and making good contact.

It will be interesting to find out what's wrong... could be connections at the GP's, or a wiring problem, or the switch or indicator could have failed.

I converted my 424 to newer Bosch self-regulating GP's and an automatic controller, it operates like a late model diesel vehicle.

Too bad you hadn't got the Bosch pencil type glow plugs, they are a much better one and are not series wired. They all get 12 volts so if one quits the other 3 still work.

Hi Bob, as mentioned previously the GPs are all wired in series. If you have a DC volt meter the black wire that goes to #4GP by the battery box should measure 6V to Ground with the GP switch ON. See attach photo.


All about Glow Plugs and more:
YTD Jdemaris link for replacement glow plugs: http://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=farmall&th=959462

Another link: http://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=farmall&th=999655

The control switch sends power through the glow indicator on the dashboard-left, and then through each glow plug. Note I said "through." They are all wired in series, one on the dash and four on the engine. If any plug goes bad, nothing will work. Keep in mind that when all is hooked in series, each plug only runs on about 1 volt. So, don't try to hook 12 volts directly to any of them.
Heat up time is long, usually around a minute. That's with the original style plugs, e.g. Champion CH28, Bosch 0250001001, Lucas DS104, etc.

Some people have converted to fast-heat conversion plugs that are now offered for old Mercededs 190D cars - that originally had the same slow system as your British IH.

I just pulled a new Champion CH28 out the box and checked resistance (it's the plug for a B275 or B414). 1.8 ohms. I also pulled a used Bosch off the shelf for the same tractors. 2.2 ohms. Both listed as 9/10th of a volt and 40 amps. 18 mm thread with a 13/16" hex.

They are rated .9 of a volt, not of an ohm.
They sell them right here on this Website for $40, but I have no idea how correct their aftermarket part is.

703557r92
Glow Plug Resistor Indicator - For Models: B250, 275, 354, 414, 424, 434, 444, 2300, 2444. Replaces 703557R92, 706685R92. (Part No: 3042230R91) $39.60

Glow plugs are Champion AG28 or CH28 (155). Bosch # 0250001001 or 0250001010
Lucas: DS104 Beru: 214GK

All are rated at .9 of a volt and 40 amps, i.e. 36 watts. Ohm's Law says ohms = volts divided by amps. That should be .025 ohm (1/4) but can't say I ever checked. I never use an ohm-meter for checking glow plugs. Too many false readings.

Also such specs can be misleading, at least to me. I suspect those plugs are rated at .9 volts because of the total system resistance, not one plug. So, all five units run in series might equal that 1/4 ohm, but I'm no math wiz.

Also used in Mercedes 190D cars besides the IH tractors.

Posted by LJD on Jan 14, 2012:

The IH B414 uses the exact same glow plugs as a Mercedes 190D car. There are complete "fast heat" glow plug upgrade kits sold now for the Mercedes that direct fit the IH B-275 and B-414. No need for any adapters. Kit comes with four 12 volt plugs that get wired in parallel instead of series - and a controller.
Complete kit with four fast heat plugs, new wires, relay, controller, etc. is $144. Here's the parts list:

The complete conversion kit includes the following

* Heavy Duty Manual Relay
* Quality push button hole mount switch
* Mercedes factory 80 amp fuse holder
* 2 - 80 amp strip fuses
* Correct size and length of wire needed
* All terminal connectors required
* 4 Upgraded Pencil type Fast Glow Plugs
* Three New Glow Plug Wires
* Complete step-by-step illustrated instructions

http://www.mercedessource.com/node/8320

You can by the kit without the controller for $80 - $120. Here is one on Ebay -but I'm sure you can find cheaper elsewhere . . .

http://www.ebay.com/itm/MERCEDES-QUICK-FAST-GLOW-PLUG-KIT-190D-200D-220D-240D-/190579548413

And you could also just buy four plugs for $15 each and figure out the rest yourself.


If you order any Mercedes kits - make sure you verify the have the 18 mm glow plugs and not the newer smaller ones.
The correct fast-heat Bosch Duratherm plug to fit your B-414 is Bosch # 0250201044. Threads are 18 mm X 1.5 - just like your originals. Work at full 12 volts and draw 20 amps each when cold and taper to 8 amps each when hot.

You can buy just the plugs at $16 each at Amazon.com and several other places.

http://www.amazon.com/Bosch-0250201044-Glow-Plug-Fast/dp/B000GTNFWK

Hope this helps
JimB