1972 Gmc Jimmy Wire Identification

[Sandtrap9072]

So, I am cleaning up some wiring in the engine compartment and came to a purple wire that was spliced into a red wire that runs to the starter. Can anyone tell me what their purple wire runs to, this doesn't seem right? Please see attached pictures. Also, where the red and purple wires are spliced, there is a green wire and a black wire that are cut, does anyone know where these are supposed to run to? Any help would be greatly appreciated.