You should
really consider a new harness......Just some info to get it started
Pic 1... Blue and brown are jumpered, jumper the red and yellow also (which is really a white) Blue and white go to alternator, see pic and put some tape on the cut wire from harness, that 10g red is from main splice, it it touches ground you will have a spark show!!!
Pic 2...Blue, white and red is alternator wiring. Looks like the insulation is cut on the blue wire. Wires in upper right need respliced and taped.
Pic 3... Where does the red wire from alternator BAT stud go to, battery?
Pic 4... Connector is for headlight, not alternator. You will need to use the junction block, that red goes to junction block and a fusible link to battery see pic. Be sure to use one with that harness!!!
Pic 5 ...That pic is real fuzzy. It shows a mini starter and the purple is going to the same terminal as the wire going to the starter itself, which would be wrong. Most mini starters don't have the "R" terminal. The purple might go to the empty terminal but I would need a better pic to be sure.
Pic 6... I would need to know where the wires go to give a answer. Ones not even a wire, looks like a oil pressure line for a gauge. When in doubt, don't connect to anything or to ground.