Sea-Dog 420101-1
Maintained switch for one circuit; requires the original two-terminal wiring arrangement.
Sea-Dog Marine Toggle Switches: Maintained vs Momentary
Replacing a boat or RV toggle means matching how it operates, not merely how it looks. Sea-Dog makes two-position on/off, three-position selectors and momentary versions with different pole and terminal counts. All six switches compared here are 15A at 12V DC; the separate 420479 cap is protective hardware.
Marine toggle action and pole-count comparison
Use the original manufacturer number and electrical arrangement when comparing these parts. The table scrolls horizontally on smaller screens.
| MPN | Switch action | Terminals | Electrical rating |
|---|---|---|---|
| 420101-1 | Maintained SPST on/off | 2 blades | 15 A / 12V DC |
| 420102-1 | Momentary SPST on/off | 2 blades | 15 A / 12V DC |
| 420103-1 | Maintained DPDT on/off/on | 6 blades | 15 A / 12V DC |
| 420104-1 | Momentary DPDT on/off/on | 6 blades | 15 A / 12V DC |
| 420108-1 | Maintained SPDT on/off/on | 3 blades | 15 A / 12V DC |
| 420109-1 | Momentary SPDT on/off/on | 3 blades | 15 A / 12V DC |
| 420479-1 | Cover accessory, not a switch | No electrical terminals | Not applicable |
Before selecting a replacement: The waterproof 420479 is a cap accessory, not a toggle switch. The six electrical switches each require their own circuit function and terminal layout. SPST, SPDT and DPDT cannot be substituted purely because the lever fits a similar opening.
What to check before ordering
- Record the original Sea-Dog number and confirm whether the switch stays in an on position or returns to off when released.
- Count the blades: two for SPST, three for SPDT and six for DPDT in this series.
- Keep the motor and reversing requirements in mind. A double-pole switch can operate a different circuit from a single-pole model.
- Verify the original mounting dimensions, toggle lever clearance and the suitability of any protective cap.
- Disconnect the battery supply before electrical service and follow the equipment wiring diagram.
Shop matching Sea-Dog parts
These exact listings can be ordered online through NewRVParts. Products ship from supplier warehouses; viewing and pickup are not available.
Sea-Dog 420102-1
Turns on only while held; returns to off when the lever is released.
Sea-Dog 420103-1
Two poles, three maintained positions; not interchangeable with a single-pole toggle.
Sea-Dog 420104-1
Spring-return on both active sides; compare the motor or actuator circuit.
Sea-Dog 420108-1
Single-pole, two selectable on paths with centre off.
Sea-Dog 420109-1
Returns to centre off from either on side, using three blade terminals.
Sea-Dog 420479-1
Protective cap for supported toggle switches; verify the original mounting hardware and cap fit.
Related marine electrical references
Continue with Contura and illuminated rocker differences, AGC fuse holder size and wire ratings, 12V outlets and USB charging options.
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