stepper/mixer for 20kw generac evo

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pnwchris
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I get overspeed 1205 warnings and can see the stepper motor is having trouble maintaining a consistent RPM. Runs fine on one cylinder (either one), as well as with me holding the throttle steady (and lower than triggers the overspeed shutdown). Stepper motor testing yields no connectivity from red to 2 out of the 4 other wires in the connector...red to black and brown are at 10 ohms. red to orange and yellow do not register. Have video of startup on one cylinder showing the stepper behaving erratically before starter engagement.

(submitted with Contact Us, as well, sorry for the duplication)

Generac 20kw Evolution series
Generator Model 0062500, Serial 8205134
Controller P/N 0J8371A
Engine model 0J9323, Serial 0898432.13164
pnwchris
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Using the generac site, looking up my serial and pulling the parts diagram, looks like the 0J7782?

https://shop.gentekpower.com/products/g ... a677&_ss=r
pnwchris
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Ordered.
Chris
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Haha, you did all the work for me! Sorry, we've been absolutely slammed with requests for tech help and parts and just trying to get caught up!
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