OutdoorKing Repair Forum Forums Repairs and Maintenance Questions On Ride On Mowers Questions On Victa Ride On Mower Frames Victa 3012TX solenoid wiring

Hello again.
Appreciate the help so far on other issue for various machines.
This question is for a Victa 3012TX where the previous owners of the machine have disconnected and unbolted the starter solenoid, for unknown reasons, and I'm trying to wire it back together using schematics from the Victa website but, have issues with the earth wire from the starter with this being a 3-post solenoid.
From what I have read about the 3-post solenoid, they earth through the solenoid body to the frame, which is the easy part to understand but, if this is the case, what is the purpose of the 3rd terminal post of the solenoid? Is it an earth or what?
Photos are attached of the schematics along with the existing wiring to be re-connected.
The problem I have is with the earth wire from the ignition, as it a bayonet connection when it reaches the solenoid end when I would have expected a flat "1/4" round post-style connection" to the solenoid. It doesn't make sense why this is is a bayonet!
If the solenoid is earthed through the chassis, then what is the point of the third post?
I would have expected the earth from the battery would be connected to this post, but the battery earth is direct to the chassis, and nowhere near the solenoid.
The kill switch from the seat (Yellow wire) is earthed through the bolt that secures the solenoid. If the third post of the solenoid was an earth point, then wouldn't it make sense that the seat kill-switch would earth through here and not the bolt attaching the solenoid to the chassis?
Too many questions for a simple answer that the electrical schematics don't answer.
Does anyone have a photo of the solenoid wiring for a Victa 3012TX, being model 31721x88B? If not, then how about the Cub Cadet variation 31721x88A of the exact same machine?
Photo attached shows solenoid and current wiring of the machine and another photo of wiring schematics and solenoid together for ready comparison.
Hope this makes sense and someone can assist in correct wiring.
Am thinking about running an earth wire back to the battery from the third solenoid post. Would this be okay in relation to other ride-on mower schematics/actuals?
Yes, I worked out the yellow wire from the seat cut-off switch was actually an earth wire to be connected through the solenoid mounting bolt, but thought it may help someone else to get it right.
A picture is worth a thousand words.
Thank you for your assistance
Regards
Daryl