Can’t see the terminal markings on the regulator, but it doesn’t look right–unless it is an aftermarket regulator. Here is the wiring diagram. It is the true story.
Note that the 20A fuse on the terminal strip feeds the power take-off posts on the bottom of the junction box cover. That is all it does. So don’t get all hung up on that unless you use the PTO. The other fat brown wires are the charging wire and go straight through the terminal strip, in one side and out the other, no fuse. The 4A fuse is in the generator field circuit (blue wire). That one needs to be there or the generator won’t work.
It is EXTREMELY important that the regulator be wired correctly. Otherwise, the smoke will get out. Identify the Bat, Gen, and Fld terminals. NEVER connect the Bat terminal to the Fld terminal.
The A terminal on the ignition switch (marked as "I" on some switches) is for an accessory that you want to operate only when the key is on, such as a fuel gauge. Otherwise not used on this motor.
The cable with grey sheath doesn’t look original. Wire colors coming from it are confusing. What’s with the white one connected to black?
