Yep, I have service manuals for the 20RZ. I have “them” actually — separate manual docs for the generator set and the controller. There is some info for the block heater install too. Surprisingly, there doesn’t seem to be a simple data sheet in the doc pack.@Zephyr7 Any luck finding that digital manual?
You need to wire it as shown in the drawing I sent. The CTs are “current transformers” and they look like doughnuts. If you only see “one leg” going through the hole in the middle of the CT, then that’s your problem. Find the other wire as marked on the drawing and pass it through the middle too. Each wire has to be in-phase (check the labels on the wires and compare them to the drawing, and has to go the same direction through the CT. The drawing is pretty clear (note where the dot on the CT is too, the wires need to pass through the side shown with the dot), make your unit like the drawing and you should be good.I have three metal hoops (I'm guessing CTs) at the top of the alternator. One leg is looped around what I'm guessing is the first CT and the next leg is looped through the second CT, the third CT has nothing through it.