hey guys im wiring up my drivers side loom to the rb25 however i have connected the alternator however i have noticed that my wiring for the r33 starter is different so im going to change it and use my vl starter however i know where the plug and red wire goes but does anyone know where the black wire along the red in the loom goes or is it just a earth?

if your solenoid only has 1 connection, its gonna be the 12v+ signal.. which is the plug so you dont need the black

The starter has a plug and a threaded terminal on solenoid it's the original starter that was on that loom so I'm assuming it goes to engine mount cause it reaches there