BILGE PUMP ALARM
A bilge pump alarm is one of those “cheap insurance” upgrades. The pump can be running for a reason you don’t notice right away (rainwater, a loose clamp, a dripping seal, a stuck float, or a slow leak). The point of this project is simple: if the bilge pump runs longer than normal, we want to know immediately.
- High water level in the bilge (separate sensor or float)
- Excess pump runtime (pump cycles too long or too often)
- Pump failure (alarm triggers if water rises but pump doesn’t keep up)
- Stuck float switch (pump runs continuously)
- Loud onboard alarm (buzzer + bright indicator)
- Optional remote alert when we’re away (future upgrade)
- Simple test button so we can confirm it works
- No false alarms from normal cycling
Approach
There are two common approaches and we’ll choose based on what’s already installed on Lucky Enough:
Add a dedicated high-water sensor in the bilge. If water rises above the normal level, the alarm sounds. This is the most direct “something is wrong” warning.
- Best for: leaks / unexpected water ingress
- Needs: sensor/float + alarm panel/buzzer + wiring
Monitor the bilge pump circuit and trigger an alarm if the pump runs too long or cycles too frequently. This is great for catching problems early (even before the bilge gets “high”).
- Best for: early warning and stuck float
- Needs: runtime monitor + alarm + calibration
Install notes for our cruiser
- Alarm should be audible from the cockpit (and ideally the cabin too).
- Use marine-grade tinned wire, heat-shrink connectors, and proper fusing.
- Keep wiring neat and serviceable with labels so future troubleshooting is painless.
- We should include a simple test procedure and do it regularly.
Parts we may need
| Item | Notes |
|---|---|
| Alarm (buzzer + light) | Prefer a unit with a test/mute button and a bright indicator LED. |
| Sensor / monitor | Either a high-water sensor or a pump runtime monitor (depending on option chosen). |
| Wiring + fuse | Marine tinned wire, heat-shrink terminals, inline fuse where appropriate. |
| Mounting hardware | Stainless fasteners, adhesive mounts, loom/clamps for clean routing. |
Status
- Confirm how many bilge pumps we have and where they’re wired (manual/auto, separate float switch, etc.).
- Decide: high-water alarm, pump-activity alarm, or both.
- Pick mounting location for the alarm where we’ll actually hear it.
- Install, label wiring, and write a quick “how to test” note on this page.