Ryobi Chainsaw rebuild?

Having replaced the oil pump gear in my ryobi chainsaw I have started to rebuild it. There were a few parts I dis-assembled that in retrospect should have been left as they were. The part that is causing me grief are one of the leads from the on/off switch. The red lead is okay and is connected, however the black lead which I am sure is the ground lead I have no idea where I disconnected it from. Please if you have this type of chainsaw please let me know where to screw in this black lead. Thanks