Quote:
Originally Posted by hatzie
# 3 is called a bulb check. It happens when the ignition is switched on. Not sure if all trucks had it. 73 - 75 were pretty simple. They might not.
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The way I read the diagram, it sure looked like it was during cranking only.
If what you say is true, is there some sort of mechanical wizardry going on in there to ground that bulb during the initial "ignition on" but not while running? How?