Installing USB Port Installing USB Port 49 of 71 With everything in place we are ready to start wiring. Unfortunately I lost the schematic I drew for this project, it's also been over a year since I completed this project, so I don't remember all the details, but I will do my best. Also I am not going to go into much detail because I figure if you are trying this you probably know the basics. If your just reading this out of curiosity then you won't be bored with facts. :) Start by wiring your switches and USB power to the charging unit. Remember, the switch is to turn the charger on and off so wire the power from the USB to the switch and then to the charger.