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54
ELECTRICAL
This article provides the Newmar-recommended step-by-
step instructions for operating the battery boost switch.
The Battery Boost switch is located on the dash and,
when pressed, momentarily connects the house
batteries to the chassis batteries via the solenoid. This
allows the chassis batteries to obtain power from the
house batteries to assist in starting the engine.
If the chassis batteries cannot turn the engine over, hold
down the Battery Boost switch and attempt ignition.
By using the Battery Boost switch while trying to start
the chassis engine, the house battery bank supplies
a battery voltage boost to the chassis batteries if the
house battery battery bank voltage is higher than the
chassis battery bank.
If the battery boost switch is required to
start the engine on a regular basis, ask your
dealer to check the chassis batteries and
charging system. 2019 and newer diesel
pusher coaches may have a dual position
battery boost switch. This simply allows
the chassis battery to be boosted from the
house battery bank or the house battery
bank boosted from the chassis battery,
allowing the solenoid to operate from
either source that has power to engage
the boost solenoid. Once a click is heard,
the solenoid has been energized and the
battery voltage will be able to flow from the
battery bank with the higher voltage to the
battery bank with the lower voltage.
Battery Boost Switch Overview
This article provides an overview of the Freightliner (M2)
Super C chassis battery bank on a front diesel coach.
Freightliner chassis batteries are sealed, non-
serviceable batteries. They are provided with the chassis
and warrantied through the chassis manufacturer
(Freightliner). The type and brand of chassis battery may
vary depending on the coach year, make, and model.
Chassis batteries may need to be disconnected and
removed from the coach to perform routine battery
maintenance. To access the chassis batteries, remove
the cover located under the driver’s door.
The chassis batteries are recharged by the vehicle’s
electrical system whenever the engine is running. With
an added BIRD, BIM, or charge bridge solenoid, the
vehicle’s charging system will also charge the house
batteries if the parameters are met.
Freightliner Front Diesel M2 Chassis Battery Overview
The inverter charger will automatically charge the coach
batteries when the coach is connected to a 120 volt
outside power source or if the generator is running. The
chassis batteries are isolated from the coach batteries;
however, when certain parameters are met, the BIRD,
BIM, or charge bridge will activate and allow charge to
the chassis battery. This prevents the chassis batteries
from being drained by the interior 12 volt equipment and
allows ample voltage for engine ignition.
This article provides basic operation instructions for a Freightliner M2 Chassis Battery Disconnect.
Freightliner M2 Chassis Battery Disconnect Overview
The Chassis Disconnect Switch is located on the floor
between the driver’s seat and the door. There is one
switch on a Freightliner chassis, and when turned off, it
will disconnect most of the chassis battery loads.
When the switch is turned off, the ignition key and
most dash components will not operate. To turn the
disconnect off and disconnect the chassis batteries, turn
the switch to the off position. When placing the coach
in storage or when working on the coach engine, turn
off the disconnect to disable starting of the engine. To
turn on the disconnect switch and reconnect the chassis
batteries, rotate it to the ON position.