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.
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