Power coming into switch is + (red wire from power source). Load is power + coming out of switch to your project +. Ground is just that - (black wire) to your ground, and your project - wire connects to ground as well....
Power coming into switch is + (red wire from power source). Load is power + coming out of switch to your project +. Ground is just that - (black wire) to your ground, and your project - wire connects to ground as well....