Yep, if you're using the harness linked in this thread, they actually have the three wires defined in the listing: Red: constant hot, Black: ground, Green: switched hot. There's a whole bunch of other wires in the stock plug, but they don't matter to us.Does any have a wiring diagram or can anyone explain how to wire up the eBay wiring harness please?
If you want a deeper dive, or if you're making your own pigtail, here's a thread...
Wiring the iBooster - EVcreate
An iBooster in your car is very attractive. This article explains wiring the iBooster GEN1 and GEN2 in detail. Our connector kit makes that even easier.