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I would concur with boatman69. You will get more participation/help on dedicated thread.

Welcome from SOOK and I would crack line at injector. You may have air lock. Does your electronic governor release from magnet correctly?

First thing I think of when someone has issue with this K8 relay. is the relay installed in K15 starter lockout a 120vac coil? Nearly every unit has a K14 24vdc and K15 120vac relays in swapped location Here are pics of A8 burnt internals. Here are pics of second gen I bought from auction...

Thanks for update. I do like the sound of the warranty. I suspect the issue with these governor, other than electronic failures, is due to people "adjusting" the pots. I noticed that the screw-slots are pretty torn up on the unit that I just had flake out. You can just place screwdriver in slot...

Symptoms sound like new controller is bad. I was hoping yours new one would work flawlessly as I was about to order one myself as the one that was out of adjustment on speed pot failed. No output to electronic governor. J&H outputs range should be in the 4-11vdc area. I have a bad controller...

That is just output of your charging circuit. All of my units run 26-28vdc. If you check voltage at your batteries you will see same. I anxious to hear about your new governor control. I'll bet the unit is way more stable and easy to adjust.

I responded to your other post as well. Make sure that the K15 relay is 120vac coil. Starter lockout relay. The other two ice cubes are 24vdc coils. Mine had been swapped around before I bought it. It didn't burn up the 24vdc ones but boy would it chatter...

Have you done the governor adjustment procedure? If gain and stability are set correctly I would think it is something else. I agree that two separate controllers exhibiting same symptoms unlikely. Possible could be a fuel issue, pinhole air leak? I had another style gen that you could turn on...

On your surging unit if you put a DVM leads set on vdc across terminals J and H (5.3 vdc at low speed and 11vdc at high speed), I would bet money that your voltage is going to be bouncing on these terminals. This output should be stable in proportion to load on gen set which determines its speed...