This is the coil trigger signal from a 2010 5.3L silverado, no open circuits. So technically, we only know that it pulls down to exactly 4V, not sure what open circuit voltage is, due to a lack of time at the end of a friday....so I didn't think to do so...damnit. This engine uses the barrel shaped coils like spfautsch used in his videos.
2010 silerado ign trigger.jpg
So there is no feedback on that signal line to worry about when it comes to this type of coil.
I will venture a guess that a 5V signal suffers a 1v-.8v semiconductor based voltage drop on one leg of a transistor tied to ground.
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