3000 EXPRESS
PROPER FUSE OR BREAKER PROTECTION MUST BE PROVIDED FOR ALL 12-VOLT
EQUIPMENT ADDED. DO NOT OVERLOAD THE ACCESSORY CIRCUIT BREAKERS OR
OTHER CIRCUITRY THROUGH ADDITIONAL 12-VOLT EQUIPMENT.
Battery Switches
There are three “ON” - “OFF” battery
switches located on the front of the Power
Plant. The switches are activated using spe-
cial keys that are attached to the Power Plant.
The port battery switch is labeled “Port” and
activates the port engine, the starboard battery
switch is labeled “Starboard” and activates the
starboard engine and the center battery switch
is labeled “House” or “Auxiliary” and acti-
vates the 12-volt breaker panel in the cabin
and all other 12-volt accessories. Make sure
that all three switches are activated whenever
the engines are running to insure that all 12-
volt accessories will operate when they are
needed. Red LED lights above each switch
indicate that the switch is on.
The Power Plant controls the charging of all three batteries whenever one or both of the engines
is operating. When one or both engines is started, the engine alternator(s) start to recharge the
batteries. This charging current passes through the Power Plant sensing circuit. This circuit senses
the charge and switches relays to connect the “Auxiliary” or “House” battery in parallel with the
engine batteries. Thus the charge from the engine(s) is split between the batteries with the lowest
battery receiving the most charge. When the engines are turned off, the charging stops and the
sensing circuit turns off the relays, disconnecting the “Auxiliary” or “House” battery from the
cranking batteries, thereby automatically isolating the batteries from one another.
Note: The relays in the Power Plant may chatter on diesel powered boats when the
ignition switches are first activated. This is caused by the relatively high current
draw of the heating elements for the air induction system in the engines. The
chattering is normal will not harm the relays. It will stop as soon as one of the
engines is started and the alternator begins charging the batteries.
When in port or at anchor, the switch that supplies the port engine and the switch that supplies the
starboard engine should be off. Only the center battery switch that activates the “Auxiliary” or the
“House” battery should be on. This will keep the engine starting batteries in reserve for starting
the engines. All three battery switches should be in the “OFF” position when leaving the boat
unattended.
Power Plant
4-2
R
70 7010 10
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