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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,274
The ignition trigger signal going through the green coax cable from the distributor is a square wave and if the polarity is correct the ignition is supposed to fire at the end of the wave or when the squared off slope drops.

I don't know if its still a square wave in the single black/purple tach trigger wire, but seems like it would be.

You find that black/purple wire at the 6 pin plug on the bottom of the CDI and also the second spade terminal over from the passenger side on the bottom edge of the back of the tach.

If you wire in a shift light or rpm switch for a homemade shift light thats the trigger wire you use for it.
Old 07-09-2010, 11:48 AM
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