Leaderboard

You can test the internal workings of an aftermarket switch with a multimeter. Use the continuity buzzer to figure which wires are connected by which switch/button. Then use that knowledge to match the new switch up to the wiring diagram's switch schematic.. That's the box diagram of each switch showing what's contacted by bars when it's on or off. If you do dismantle a switch be very careful not to loose the tiny springs or balls from inside it.