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Hi and welcome back to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, on "...What should the voltage be on CDI light blue wire ?with key on or key on and cranking..."; on any instance, the light blue wire should have 0V as it would be tied to the ground through the neutral switch.
On the other hand, the black/white wire should not be tied to the ground to allow the CDI to fire.
Grounding the black/white should kill the CDI/engine, hence check the kill switch and its wiring (including the ignition switch).
Grounding the light blue wire would "simulate" neutral switch action and would allow cranking.
The black/white and the light blue serves two (2) separate/different interlock functions and has nothing to do with each other except served by the same CDI.
Remove the new CDI and battery connections. Test with a continuity/ohmmeter both the harness' black/white and the light blue wires (again CDI disconnected) with respect to engine ground:
Repeat test using frame as ground.
And then again with - battery cable as ground.
There appears to a lot of disparity when different grounds are used; engine, frame and battery - cable. Normally, these three (3) should give equal readings as all are tied to the same ground. Consider hardwiring:
Based on the previous tests and the above post of "...will crank...", the new CDI seems to have fixed the "... will not crank..." making the old CDI partially faulty.
UN-grounding the black/white wire of the new CDI should allow the CDI to fire the ignition coil = spark:
What wire color(s) of the "...ignition switch, CDI, voltage reg, etc..." were tied to the "...new ground..."
And can you please re-check the battery voltage:
Sorry, measure battery voltage with no charger connected. Please repeat above checks.
And re-try momentarily jumping the 2 big terminals of the starter relay/solenoid.
Post back results / observations of the above once tried.
"... IT cranked and started..." - will it shut off when ignition switch is turned OFF?
I understand; later when able then.
"...will not shut off when key is turned off..." would point to possibly a faulty ignition switch and/or a connector/wiring issue with the black/white and black wires.
Would it shut off with the Engine STOP switch?
But will grounding the black/white wire of the CDI shut the engine off?
Appreciate your patience.
"...ground to black/white does not kill engine..."; would this be CDI's black/white wire to CDI's black wire? (...and not just momentarily)
With the CDI completely disconnected from the Grizzly's harness/connector, what is the resistance reading between the CDI's black/white wire to CDI's black wire? ...
What are the other wire colors of the CDI?
To my recollection, the original CDI has 2 faults; will not permit cranking and will not produce spark.
This new CDI will now permit cranking and produces spark EXCEPT will not turn OFF.
Based on the above, the new CDI is also partially faulty.