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All these volts/resistances and current draws!

In the end a glow plug is very similar to any other.
What is important is Watts. To get say 80 watts they could make a glow plug draw 10 amps at 8 volts. Or 40 amps at 2 volts.
The product of the volts x the amps is the watts, That's watt its all about really!
From the watts you can get the resistance. There is a formula but seeing we have both volts and amps- use them.
R = V/I ( I used for Amps). So the resistance is 8/10=0.8 ohms in case one and 2/40= 0.05.in the second case.

One thing about using a 'cold' measurement when trying to read resistance is that as that resistance gets hotter and hotter the resistance gets higher and higher. So its basically a waste of time doing this.
Measure the current and then the voltage across the glow plug- work out its resistance then compare with the reading your multimeter gives you. You'll find a big discrepancy. But taking the current through the load ( the glow plug) and the voltage across it will gave an accurate Wattage and the resistance will be good two.

TC29D glow plug resistance
New Holland Tractors
Replies 13 Post by whiterose