Attached is an enhanced wiring diagram, where I went back through all the colored wires on this tractor, and added the actual color, to the low resolution electrical diagram previously supplied. Note that my "dashes", just signify that each wire has a continuous double color stripe, not dashed. Does this help our conversation?
I am hesitant to reassemble the red top to the tractor, because it takes over an hour to either remove it, or restore it. You have to reconnect then engine throttle cable, the steering wheel, temporarily locate the gear lever so it fits through the slot, remove the battery and reinstall. Add to that, the plastic top doesn't fit over the brake release lever without 2 people stretching and bending the body, and the lever cannot be removed or replaced with the cover on.
Are there any other diagnostics I should run with the top off? There is no neutral switch on the transmission. Last status, engine runs with cover off, with all 4 safety switches artificially closed with spaded U wires.
I appreciate all the insights provided by you readers so far. Thanks.