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Rocker Switches

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Frequently Asked Questions

Choose the switch action based on what the accessory must do. An on/off switch stays in the selected position. An on/off/on switch gives you two switched positions with a center off. A momentary position springs back when you release it, which suits functions such as retract/extend or temporary activation. {{website}} currently filters these circuitry types separately. Match the required control behavior first; a switch that looks identical can operate very differently.

Match the circuit function, not just the number of terminals. SPST is typically used for one simple on/off circuit. SPDT switches one common connection between two outputs or positions. DPDT switches two circuits together. The current {{website}} assortment includes examples of all three. When replacing an existing switch, use the original wiring diagram or part specification to match pole/throw function and pinout—a same-terminal-count switch can still behave differently.

Only if the required cutout and mounting style match. Similar-looking switches can need very different openings: current RV Designer products on {{website}} range from small rectangular cutouts such as .508 x .756 inch to larger DPDT openings, while Rigid's 40191 uses a 3/4-inch mounting hole. Measure the actual opening and available depth before ordering, and compare the product's cutout—not just the face size or switch color.

Compare the accessory's current draw with the switch's DC amperage rating at your vehicle voltage. If the load exceeds the switch rating, use the switch to control a properly sized relay rather than carrying the full accessory current through the rocker. Painless specifically warns that switch failure can occur when the powered component exceeds the switch's capability. Also protect the circuit with the correct fuse or breaker for the wiring and load.

Confirm the switch voltage rating and its exact pinout before connecting anything. A lighted rocker can need a separate lamp or ground connection in addition to the switched input and output, and terminal locations are not universal across similar-looking switches. Painless wiring guidance shows that a lighted rocker adds a backlight power connection compared with a non-lighted version. Use the product-specific diagram so the indicator lights at the intended time without miswiring the accessory circuit.