Chapter 6:
Electrical
A Newmar coach's electrical and lighting system is designed for maximum reliability, functionality,
and
style. Electrical wiring holes in the aluminum frame are ringed with plastic grommets to protect
wires
from chafing. This category provides detailed information about the components of your 12 Volt
and
120 Volt electrical systems, your chassis and house batteries, as well as your coach
management
systems and fuse panels.
Under each sub-category, you have access to owners manuals, user guides, parts and service
manuals, and product specifications for each aspect of your coach's
electrical system.
Due to the risk of electrical shock, service should be performed by a qualified electrican or authorized service
technician. The electrical system may have multiple 120/240 volt power sources. All power sources must be
turned off, and any auto generator start features must be disabled prior to servicing.
12 Volt Electrical System
Provides general information about the components and functions of the
12 Volt Electrical System (DC) in Newmar
coaches.
Power Sources
The 12 Volt
Electrical System allows certain components to
maintain a low voltage from the
battery bank. The battery
bank is
controlled by the coach charging system, which
consists
of a charge bridge solenoid, a bi-directional isolator
relay delay (BIRD), or a battery isolation manager
(BIM).
When the coach engine is running, the alternator
charges the chassis batteries and may assist in charging
the
house batteries
through the
BIM, BIRD, or Charge
Bridge.
When the coach is connected to shore power or when the
coach generator is in use (when shore power is
unavailable), the converter or
inverter/converter
combination
recharges the house batteries,
and with
the
assistance o a
BIM, BIRD, or Charge Bridge, it
can also charge the chassis batteries.
In addition to the alternator and converter, the coach may also be equipped with solar panels to provide an
additional option for charging your house batteries.
Alternator
The alternator is a belt-driven component attached to the coach engine and is
supplied by the chassis
manufacturer.
The alternator supplies power for chassis components
such as batteries,
lights, wipers, dash HVAC, and
power seats, as well as all of the driver controls located in the cockpit.
The alternator charges the chassis batteries, but
with the addition of
a BIM, BIRD, or Charge Bridge, it may also assist in charging the coach's house batteries.
Generator
When shore power is unavailable, the
generator takes mechanical energy and converts it into alternating current to
supply 120 volts
to the coach and
charge the coach's house via the converter or inverter/converter and the
chassis
batteries via BIRD, BIM, or charge bridge.
The generator is typically located in the front of the unit between the frame rails on diesel coaches.
On gas units, the
generator may be located anywhere between the mid and rear section of the coach.
Generators can be powered by gas,
liquid propane, or diesel
fuel.
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