Specifications: Electrical System
The following section describes the electrical systems aboard
the boat, how they operate, where they lead, and how not to get yourself
in trouble. Please read this section over more than once. For wiring code
information please refer to the color code diagram.
DC Electrical System
A 12 Volt DC electrical system is used throughout the J/42
for lighting and operation of pumps and various accessories. The J/42
is standard with two 105 Amp deep cycle gel-cell batteries located under
the navigation table.
- Electrical Panel: is built by Bass® and controls electric
distribution with circuit breakers and switches. The main wiring harness
runs from the back of this panel.
- Mast Wiring Terminal Box: is located in the forward head on
the bulkhead. A wiring harness exits the mast near the box, and is wired
directly into the D.C. system through a terminal strip. Once this wiring
is installed, test each function to insure proper operation.
- Battery Switch: The battery switch located under the navigation
table turns access to the battery ON or OFF to the main panel and engine.
The standard J/42 is configured with one battery on each leg of the
switch. In the event neither has sufficient charge to start the engine,
turn the battery switch to “BOTH” to combine the power of
the two batteries to get things operating. When the engine is running,
the battery switch should be in the “both” position for
both batteries to be charged.
- Alternator: is attached to the engine and will create current
only when the engine is running. The output is connected directly to
the Battery switches to distribute the current to the batteries.
- Accessories: such as navigation instruments, stereos, radars,
GPS can be added to the electrical panel and the 12 VDC system. Extreme
care and forethought is necessary for installation as these are sensitive
instruments and require some measure of protection. Such work should
be performed by a marine electrician. Be sure all sensitive accessories
are not only grounded properly but that “fast blow” fuses
are run off the panel for extra insurance against damage to their components.
Optional 110 Volt A.C. Shorepower System
The 110 volt AC shore power system is functional only when
the boat is plugged into suitable power from shore. The cord provided
as part of the operation has the standard end for 30 amperage service.
Depending on the wiring in the facility, various adapters may be required
to plug into the shore end. The boat end of the cord plugs into the inlet
on the port cockpit coaming. Ensure the plug prongs match those on the
inlet, insert and twist to lock it. Then screw down the outer ring to
seal the cord from water and to prevent if from pulling out. The AC panel
for shore power is located in the nav station.
- AC Panel: indicates line voltage being received from the shore
circuit with an indicator light. The line voltage will vary with the
number of appliances operating on the same circuit. In large marinas
there may be a large number of boats on the same circuit, causing fluctuations.
- AC Normal/AC Reverse Polarity Light: The AC panel has a red
light to show when the polarity is reversed. Care should be taken not
to operate 110 AC systems on board with reverse polarity.
Galley Stove LPG System
Liquid Propane Gas (LPG) is the most common fuel used for
boating and is available at most marinas in the U.S. The force 10 stove
is of very high quality and is engineered for the marine environment in
high-grade stainless steel. It is comparable to a home range.
The biggest difference is safety. While the home gas stove
utilizes a petroleum gas which is lighter than air (it disperses easily
if there is a leak), the propane stove utilizes a gas which is heavier
than air, and thus, sinks to the bottom of enclosed compartments. All
J/Boats equipped with LPG stoves utilize a safety system prescribed by
ABYC and USCG guidelines. This includes an independently vented and sealed
compartment for the tank, an electronic solenoid shut-off valve, a regulator,
and a approved LPG hose.
- Propane Tank: is located in a specially designed compartment
to starboard in the stern which ventilates over the side to specifically
eliminate the accumulation of dangerous gases.
- Lpg Gauge: sits atop the tank to measure the amount of pressure
left in the tank.
- Solenoid Cap Valve: is located on the hose in the aft propane
compartment. It electronically shuts-off the flow of gas at the tank.
This valve is a “normally closed” valve; therefore electrical
power must be provided so gas can flow to the stove.
- Regulator: is located on the hose in the aft propane compartment.
It is a screw down valve which regulates the flow of propane into the
- Check all burners (including oven) knobs are off.
- Check manual valve on tank and open.
- Ensure battery switch is on and 12 volt power available.
- Turn on solenoid valve switch on electrical panel.
- Open burner valve on stove slightly and light burner. Always apply
flame or sparker to burner before opening valve.
When Cooking is Complete
- Turn off solenoid valve switch on electrical panel first to shut-off
supply of gas at the tank.
- After flame of burner goes out, turn off knob for burner (this purges
gas from lines).
- Firmly close manual valve on tank — DO THIS EVERY TIME!!
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