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J/105 Owner Guide ...................................................................................................................................................................................................................................................... 36
Electrical System
The following section describes the electrical system aboard the boat, how it operates, where it
leads, and how to avoid trouble. Please read this section more than once and refer to the
electrical diagrams included in this manual. For wiring code information please refer to the
color code diagram.
Never:
•
Work on the electrical installation while the system is energized;
•
Modify the craft’s electrical system or relevant drawings: installation, alterations and
maintenance should be performed by a competent marine electrical technician;
•
Alter or modify the rated current amperage of overcurrent protective devices;
•
Install or replace electrical appliances or devices with components exceeding the rated
current amperage of the circuit;
•
Leave the craft unattended with the electrical system energized, except automatic bilge-­‐
pump, fire protection and alarm circuits.
DC Electrical System
A 12 Volt DC electrical system is used throughout the J/105 for lighting and operation of pumps
and various accessories. The J/105 is standard with one 12 volt 90 amp battery located under
the cockpit aft of the engine. Optional battery capacity may be added within this locker.
•
Electrical Panel -­‐ 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 on the upper portion of the bulkhead just inside the
head to port. The mast wiring harness exits the mast just beneath the deck, and is wired
directly into the D.C. system. The junction box is wired directly into the DC system
through a terminal strip. Once the mast wiring is installed and mated at the junction box,
be sure to test each function to insure proper operation.
•
Battery Switch -­‐ The battery switch is located aft on the starboard settee berth face. It
turns access to the battery ON or OFF to the main panel and the engine. The standard
J/105 comes configured with one battery, so select BOTH on the switch. The optional
second battery enables full use of the switch and allows one battery to be reserved
exclusively for the engine and the ability to double up the cranking amps for cold starting
in the BOTH position. The engine alternator will only charge the battery selected by the
switch, so it is wise to have the switch set to BOTH should you have the additional
battery.
•
Alternator -­‐ The 60 amp alternator is attached to the engine and creates a charging
current for the battery system when the engine is running.
•
Accessories -­‐ such as navigation instruments can be added to the electrical panel and the
12V DC system. We recommend that owners hire a qualified marine electrician to install
electrical components. Be sure all sensitive accessories are not only grounded properly
but that proper fuses are run off the panel.