We're getting pretty deep in the thread here and perhaps this should be a new topic but this goes back to my earlier post about not feeling right bypassing the resistor in the glow plug relay circuit.

Can someone explain to me the difference between an 11v Glow plug and a 6.2v glow plug? The way I see it is they are both just resistance heaters and in each one the heat generated is in direct proportion to the amount of juice introduced. I suppose it's possible that one, having perhaps a smaller filiment or less mass, will heat up faster, but I would suspect that after the first second or two they would be giving off relatively the same amount of heat. This might explain the "Fast start" nickname attached to the 6.2v plugs as they may get there faster if they are designed with a smaller filiment. But it would follow that during the second part of the cycle, once the truck is running, 6v to either plug would be exactly the same amount of heat, as the plugs are already hot.

Am I out to lunch here?