Originally posted by burger
This would not be accurate as the glow plug is not electrically powered when in the car.
Yeah I was thinking the same thing,,, glow plugs not electrically powered.
I was just thinking the glow ignitor would show me the difference between different makes of plugs, even though they are rated as "cold", "hot" or something in between. And if you can measure the difference between plugs, then that could be used as a tuning option for your engine.