DMcQuinn, Thanks for the info.....I just took your advice and it appears you are correct. I took my old 1.5 volt lantern battery, took out the glow plug and hooked them together while looking at the amount of glow in the resistive element (rather scientifically subjective). I then hooked up the glow plug to the power panel with the rheostat turned all the way down, slowly brought up the rheostat until the glow plug began too glow and incresed the power until it glowed with the same intensity as my hobby battery was producing. It is drawing about 2.6 amps on the power panel meter, and this reading shows up in the Green zone on the meter which looks like Hobbico 's "good" zone for normal glow plugs...I guess the voltage like you said is meaningless until you draw some current to allow regulation to occur. Anyway, thanks for the info looks like the unit is working great...I was afraid I'd be throwing 11 or so volts to the plug and that worried me.