Ordered some parts for the 446 and they showed up in the mailbox today.
The tractor hasn't been charging very well Occasionally it would charge for a few minutes but then nothing.
So being somewhat conservative in nature I decided to not go with genuine parts and ordered a 3 terminal replacement regulator/rectifier.
The original is on the left and the new one is on the right...
The original Regulator had one yellow charging wire attached to it with the second yellow wire attached to the red wire going to the battery.
I simply attached the 2 yellow wires to the terminals marked AC on the new regulator and the red wire to the terminal marked Battery. Gave it a test run tonight and it works great,, Charges at 10 amps for awhile and then starts going down until it stays steady at 2 amps on the amp meter. Sure is nice to have it working right.