By taking the time to learn how your switch wiring system works, you can reduce your risk of electric shock or fire when working with switches. Tips Once you know how to wire a light switch, you ...

Rocker switch wiring might seem complicated, but it's easy to understand once you break it down. These switches are things we ...

87 (red wire) connects to the positive wire on the electric fan. 30 (other red wire) needs constant 12-volt power from the battery. 86 (gray/white wire) goes to the ignition switch.

The diagrams and photos show how to wire up the fuel pump and oil-pressure switch to a commonly available, industry standard, ISO-type "1 Form C single pole/double throw" (SPDT) relay.

According to my Wiring 101 crash course — courtesy of a day spent shadowing said electrician — a lack of neutral wire in our switches wouldn’t have been the end of the world.