david85
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Found it.
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Is that a home made circiut or is that an internal diagram for the OEM controller?
One question I have about the original idea, is why he didn't simply use the temperature switch on the front of the engine (the one that controls the cold idle and advance) to act as a temperature interrupter? I did that for my manual glow plugs and it works great.
EDIT: looks like Jim beat me to it.