Nav station switches

(return to Systems Description "12-v DC")

Bilge pump 3-way toggle switch -

POSITION	ACTION
UP	automatic: starts when a certain level is reached, stops when lower level reached
CENTER	off: pump never runs
DOWN	manual: pump runs whether or not there's water to pump

• Notes (above):
  • Do not let bilge pump run "dry"; when in DOWN position, turn switch to CENTER or UP
    when higher-pitch sound from pump indicates all water is pumped out.
  • Pump is NOT fused in Nav Station switch panel, but its fuse is inline, bundled in
    wiring above Battery 1, in battery compartment behind nav table seat.
    Fuse is type AGC, current 15-amp.
  • See Systems Description for more mechanical, electrical, and operating info of this pump.

Upper horizontal row of 6 toggle switches (up is ON)

SWITCH	AMPS	CAPTION	OBSERVED FUNCTION
1	30-A	MAIN	powers (12-V) and protects upper #2-6, and lower #1-6 switches, but not 7 vertical switches
2	10-A	NAVIG LIGHTS	believe lights that Ted fixed (Aug-Sep07) i.e. sidelights at top of topsides and sternlight
3	10-A	STEAMING LIGHT	blows #3 CB after drawing > 50-A
4	10-A	CABIN LIGHTS	not observed (Sep07)
5	10-A	PRESSURE WATER	shows c. 5-A when pump runs
6	10-A	BLOWER	(blower probably disconnected (Sep07))

Lower horizontal row of 6 switches (up is ON)

SWITCH	AMPS	CAPTION	OBSERVED FUNCTION
1	sw?	SUMP PUMP	source bussed to 12-V, but switched conn isn't wired
2	sw?	FORE DECK ILLUM	blows CB (Sep07)
3	sw?	NAVIG INSTR	no observed change * activates 12-V DC to Datamarine instrument sub-panel * also powers 2-AMP inline fuse with cut out-going wires
4	sw?	MASTHEAD LIGHT	shows approx 2-amp, don't know what light goes on
5	sw?	RADIO	activates fixed VHF transciever power
6	sw?	ACCESSORY	probably works, but passageway socket disconnected?)

Note: in AMPS column above of the six switches above, "sw?" means that (Apr08) we saw no amperage rating,
which probably implies that they are switch-only devices, without a circuit breaker. In this case, they count on
the "'MAIN'" (leftmost upper switch #1) for over-current protection.

Vertical column of 7 switches (right is ON)

SWITCH	AMPS	CAPTION	OBSERVED FUNCTION
1	SW	no caption	not wired up
2	25-A	Auto Pilot	unknown
3	SW	REFRIGERATION	unknown
4	SW	STROBE	unknown
5	SW	ANCHOR	unknown
6	05-A	PHONE	unknown (note: there's a "phone" shore connection on port quarter)
7	15-A	RADAR	activates RADAR power (approx 3-amp warm-up) (wire cut Apr08; RADAR removed to bench-test)

NOTE: "SW" in the table above indicates that we observed (Apr08) no marking on these switch units
to indicate that they have any circuit-breaking function.

NOTE: The 12-volt feed to these seven vertical switches NOT protected against over-current
by the 'MAIN' circuit breaker on the top horizontal row of switches, nor by any other known breaker or fuse.
However, the ammeter DOES display these switches' current loadings

Right-hand sub-panel (NAV instruments):

   This unit controls meter illumination intensity in Nav instruments; 
   it probably also control powering them on and off;
   it also has a distance log, probably driven by a signal from e.g. knotmeter.  
   (ThomS has notes on wiring, only in markup form on a copy of panel wiring dgm.)