The Fan-Tastic Vent 4100 M/L wiring is built around remote lid raise/lower controls, a three-speed fan and a four-circuit harness. The original Dometic drawing separates the fan's supply wires from the lift-motor connections and shows the plug-and-socket pair at the vent.
Original Dometic 4100 wiring schematic
Unlike the 3300 thermostat-and-rain-sensor arrangement, the 4100 M/L drawing focuses on a remotely mounted lid switch, fan switch and the wiring harness. Dometic labels the four-circuit male connector 50-84-1040 and its loose mating cap 50-84-2040. Confirm the plug style before making electrical repairs.
Open the full-size Dometic PDF to zoom in on the wiring and connection numbers.
Open the 4100 wiring schematic (PDF)
Wiring callout reference
The identifiers below follow this model's drawing. Use the diagram for actual terminal locations and routing; the table helps locate the corresponding wire number or connection.
| Callout | Wire / part reference | Function in the drawing |
|---|---|---|
| 1a | — | 16-gauge red lead from fan motor to thermal-protected speed selector |
| 1b | WS-0110-09 | 16-gauge black lead from speed switch to 4A slow-blow fuse |
| 1c | WS-0341-09 | 16-gauge black lead from fuse to four-circuit male connector |
| 2a | — | 16-gauge white return between fan motor and lid switch in base |
| 2b | WS-0323-81 | 16-gauge white return between lid switch and four-circuit connector |
| 3a | WS-0647-92/88 | 18-gauge blue/red-striped lead from lift motor to four-circuit connector |
| 3b | WS-0647-92 | 18-gauge blue lift-motor return to four-circuit connector |
| 4 | — | 16-gauge black positive feed to two-circuit supply connector |
| 5 | — | 16-gauge white supply ground to two-circuit connector |
| Connector | 50-84-1040 / 50-84-2040 | Original male four-circuit Molex plug and female mating cap references |
Photographs of related Fan-Tastic service parts
These are actual NewRVParts product photos to help identify the kind of component being serviced. Match the original manufacturer's part number, colour, connectors and production version with the individual listing before ordering.
Confirm the correct vent before ordering
The wiring document is titled 4100 M & L. Compare both the roof-fan model and the original remote switch panel before selecting a substitute. A switch from another 4000-series vent is not automatically interchangeable.