MJM Yachts 29z Outboard - Manual (Page 24)

CHAPTER 6 ELECTRICAL SYSTEM
- 24 - 29z
Shown above are Battery
Selector Switches located
under the companionway step
(l to r): START and HOUSE
battery banks. A momentary
parallel switch is located on the
console under the ignition
switch to use in an emergency,
should your START battery be
incapable of starting the engine
and you need to draw power
from the HOUSE bank.
If the engine is not running, the
batteries can be charged by the
optional AC shorepower or
genset and battery charger or
by the alternator when the boat
is operating.
Never allow your DC system’s
voltage to fall below 11.2 volts.
Sensitive electronics may fail to
function. For this reason, it is
advisable when leaving the
boat to turn off all loads, turn off
their respective circuit breakers,
and turn off the main DC
battery switches. The only load
that remains on when the
battery switches are in the OFF
position is the bilge pump
circuit. (Any CD/DVD also uses
a tiny amount of DC power to
maintain memory settings.
To use DC components, the
house battery bank switch
must be ON, the main DC
disconnect breaker on the
panel must be ON, and the
component’s respective
breaker must be ON.
The generator (if fitted) uses
the engine start battery, but it
has a dedicated battery switch.
The engine battery switch
needs to remain ON while the
engine is running. Likewise for
the generator battery switch
when it is running.
The house battery switch can
be switched OFF when the boat
is not used, and the batteries