How can i fix my rideon white LT 12 138-656-670?

Hi,

I recently purchased a second hand White LT12 ride on lawn mower with 38" blade, the starter seems to have a wiring problem and upon inspection it seems someone has "tried" to fix it in the past. Now I need a wiring diagram so I can fix any issues and repair any damage. Can anybody help please.

yours sincerley
mitch