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Old 01-07-2016, 06:14 PM   #7
Reserector
the Flaming Marshmallow
 
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Join Date: Oct 2015
Location: Laurel, MS
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You are absolutely right. That diagram was garbage. I fixed it, and made it match what I did. Thanks for pulling my head out of my butt.

To answer your last question:
Marker lights off, turn signal on - Power from the turn signal also powers the small corner marker bulb, which then finds its ground by passing through the big bulb's marker filament to ground. The small bulb does not draw enough current to make the big bulb's filament glow.
Marker lights on, turn signal on - The small bulb is powered by the same power that supplies the marker filament of the big bulb. But now, when the turn signal supplies power to the OTHER side of the small bulb, it sees equal power on both leads and cancels out. It is the same as no voltage on both, because there is no FLOW.
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