I'd like to design my own glow driver and am looking for information on glow plugs. My understanding is typical resistance is
about .3 ohms, and that when they flood they can draw upwards of 5 amps or higher to clear them. Depending on plugs the
resistance varies some. The Pro South driver uses a pwm scheme to drive the plug from four cells. I assume the resistance of
the plug changes as it starts to flood. What are the using to determine the change to the duty cycle of the pwm, the resistance
of the plug?

Thanks,
Phil