Owner`s manual

2870 OFFSHORE
There are two (2) battery selector switches located in the
transom area of the boat. One battery switch feeds the starboard
engine and the 12-volt accessory panel. The other battery
switch feeds the port engine. 12-volt power can be supplied by
either battery #1 or battery #2 separately or by both batteries
simultaneously. The selector switches also direct the charging
current when the engines are operating.
For example: When both selector switches are on battery #1, both engines and the 12-volt panels
will be powered by battery #1. Battery #2 will be isolated and in reserve. Battery #1 will be charged
by both alternators. When both selector switches are on battery #2, both engines and the 12-volt
panels will be powered by battery #2. Battery #1 will now be isolated and in reserve. Battery #2
will then be charged by both alternators.
When both selector switches are on “ALL,” the batteries are connected in parallel. Thus, both
batteries are used by both engines and all 12-volt equipment.
The “ALL” or “BOTH” positions should only be used when starting the engines, as this requires
extra electrical power, or in case of a charging system malfunction on one engine. Otherwise, it
is recommended that one selector switch be set on battery #1 and the other switch be on battery #2
when the engines are operating. When in port or at anchor, the switch that supplies the port engine
should be off and the switch that supplies the starboard engine should be on either the battery #1
or the battery #2 position. This will keep one battery in reserve for starting the engines. Both
switches should be in the “OFF” position when leaving the boat unattended.
Note: Current is supplied to the automatic float switch for the bilge pump when the
batteries are connected and the battery selector switches are off.
4-2
Battery Selector Switch