Mainship 40 Trawler Single Operator's Manual - page 78
Mainship 40 Trawler Single & Twin • DC Electric Systems
7.2
DC Electric System
Your boat has a 12 V DC negative ground and a 120V
Hz (Hertz) AC electrical system. Your electrical system
was thoroughly inspected at the factory before your boat
was delivered to your dealer. The DC Electric System
consistsof the following systems or components:
Battery Switches
DC Distribution Panel
Helm Controls
Batteries
Battery Charger
Pumps
Lighting
CO Monitors
Waste Systems
Engine Controls
Bilge Blowers
Appliances
Windlass
Trim Tabs
Gauges
7.1 DC Power System & Components
To operate the 12V DC System
1. Switch the main battery switch in the engine com-
partmrnt to ON.
2. Switch the DC MAIN circuit breaker at the DC
Distribution Panel to ON.
Note: Always switch circuit breakers off when you leave
your boat unattended.
7.1.1 Battery Switches
Each battery bank is wired to a battery selector switch
(Fig. 7.1) located on the engine room aft bulkhead. The
battery switch controls the delivery of DC power from
the batteries to the engine and all components using DC
power.
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Off position
On position
Figure 7.1 Battery Switch
7.1.2 Battery Switch Panel
The battery switch panel supplies power to all the major
systems of your boat, as well as controlling power to the
"constant hot" systems. These are systems that need or
have power supplied to them whether the battery switch
is on or off.
Note: For safety and convenience the following items are not
shut off by the battery switches:
Bilge Pumps
Sump Pump
CO Monitor
Stereo Memory
Engine
These items need constant power to perform their task.
This allows the bilge pumps to operate any time excess
fluid accumulates in the bilge. The remaining DC system
is turned off with battery switches.
Figure 7.2 Battery Switch Panel
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