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The highest current which will flow, according to all the diagrams which have been posted here, is at the point of contact closure when the Relais is first activated. This initial current is proportional to the cold resistance of the Glow Plug[s] and the Voltage of the Battery. The Battery...

Thank you Hasdrubal for posting the spec for the AC60G. I went by the published specs, which state that they are 200W at 10.5 Volts. Unfortunately, I cannot enlarge the spec4.jpg file enough to read the table. As far as I know, all the old style "1 Minute Plug" have been phased out by the...

The ac60g are what we call 1 minute plugs vs the Wellman are 15 sec plugs or fast start plugs

The Wellman's reach their peak temperature in 15 seconds and that's when the plug reaches its highest resistance - the current chart confirms this - so it's seconds for the current. The ac60g is a different type of glow plug the temperature increase does not change the resistance / current over...

Well, it appears that the ac60g is a constant wattage plug and the other with the chart a constant temperature plug -then we would compare apples with bananas

I see - 200W @ 10.5 V = 19 Amp per glow plug with a battery voltage of 12.5 Volt that would give you 16 Amps per plug with a battery voltage of 13.25 Volt that would give you 15 Amps per plug multiply the amps for the battery voltage you got by the number of plugs your engine uses - that...

Do the glow plugs you use have a NSN? If yes I hen I may be able to find the specs.

See if you can find the resistance for your glow plug - then just use Ohm Law to calculate your cold current. That's the highest current the Glow Plug will draw - similar to a light bulb :beer:

The MEP 002A/003A uses 24 Volt Glow Plugs which have a cold state resistance of 5 Ohm +/- 0.25 Ohm tolerance. At 24 V they draw 4.8 Amps then they tapper off when the Glow Plug gets hot. Peter