How to Wire a Three-Way Electrical 12-volt Switch
by Phil Altshuler
Three-way low-voltage switches are available in several different varieties. There are rocker, toggle and push-pull styles, and they come in a large number of colors and designs. These switches are in automobiles, boats and recreational vehicles. They control accessories that require a two-position switch. Some are available with a light, indicating when the device is on. This is particularly useful when the accessory is not visible from the switch location.
Step 1
Disconnect the positive battery cable. Locate an appropriate switch-mounting location. Drill or cut an opening to accept the switch.
Step 2
Mount the switch by removing the outer lock ring on the top of the switch. If you are mounting a rocker switch, you may have to trim the opening with a file to get the switch to fit correctly. Rocker switches snap in without a lock ring.
Step 3
Use a continuity tester to verify the switch configuration. Route the wires to the switch. You will have one wire connected to a positive 12-volt source, and two wires that go to the loads.
Step 4
Strip the wires back 3/8 inch. Insert them into the crimp end of the spade connectors. Crimp the ends onto the wires.
Step 5
Wire the switch by connecting power to the center terminal(s). The loads attach to the other two terminals. Push connectors onto the switch terminals.
Step 6
Connect the battery and verify that the switch works correctly.
Tips
- If you are going to drill a hole to mount the switch, check behind it before you drill into something. Twelve-volt three-way switches are designed one of four ways. Some have a continuous-on position, located on either side of a center-off position. Others have a momentary-on position, located on each side of the off position. They are available in single-pole double-throw and double-pole double-throw configurations.
Things You'll Need
- Continuity tester
- Screwdrivers
- Wire
- Spade connectors
- File
Warnings
- Always be sure that all power sources are turned off before starting to work on any electrical project.
Writer Bio
Phil Altshuler has written award-winning ad copy and sales-training literature since 1965. He is an expert in conventional and sub-prime loans, bankruptcy, mortgage loan modifications and credit. Altshuler was a licensed mortgage broker in California and Arizona, as well as a licensed electrical contractor. He has a Bachelor of Science in electronic engineering from California Polytechnic State University.
