Rule 33ALA High Water Bilge Alarm wiring diagram

33ALA is the 12 V alarm kit. It is intended to warn when bilge water rises beyond the normal pump-control level. Place its float about 2 inches (5 cm) above the existing bilge-pump float switch, with clearance for full travel. Sharing the ordinary pump float would cause an alarm during normal pump cycles and would lose the intended independent high-water threshold.

The manual’s wiring diagram shows battery positive, the high-water float, a 1 A fuse, then the red alarm lead; the black alarm lead returns to battery negative. Provide source-side protection for the wiring as required by the installation as well as retaining the specified alarm fuse. The catalog’s supply pair represents the alarm circuit as an assembly; it does not show the float closed inside the enclosure. No current demand is derived from the 20 A float-switch rating in the model table.

Put the audible/visual panel where the alarm can be heard and seen. The panel cutout is 2.125 inches (54 mm). Keep sealed joints above expected bilge water, support the cable and follow the float mounting illustration, including its 30-degree longitudinal and 5-degree transverse limits. The equipment tolerates the illustrated spray exposure; that is not permission to direct a cleaning jet into it or expose it to fuel and corrosive liquids.

Lift the high-water float’s test lever and verify both audible and visual indications at the normal helm position. Lower it and confirm the alarm clears. Repeat during routine bilge checks and inspect the separate float for obstructions. A running bilge pump does not prove this circuit is healthy. The walkthrough is an overview because the external float topology and unpublished alarm consumption cannot be represented by an ordinary fixed-current load example.

Rule installation manual, 950-0524 Rev F, July 2021; pp. 3–5 mounting, p. 8 functional test, p. 10 series circuit with 1 A fuse, p. 14 model table. The original PDF is retained in the marine source ledger. The drawing represents the identified electrical interfaces; it does not simulate the equipment’s mechanical performance, radio signals or fluid system. Unpublished connector ampacity and startup current remain unspecified.