180
2009
K
night
Electrical Sy
stems - Chassis - 9
cHASSIS ELEcTRIcAL - INTRODUcTION
This section contains guidelines,
procedures and information that will assist in
understanding the chassis electrical system and
the operation of various components. Refer
to the OEM manuals included in the Owner’s
Information File box for their respective,
in-depth, individual component operating
instructions.
BATTERY DIScONNEcT
Chassis
The chassis battery
disconnect is located on
in the curbside battery
compartment. The switch
controls the DC power to the front electrical
panel, front distribution box and rear
distribution box. Most chassis and engine
functions are interrupted when the battery
disconnect is turned off. Some electronic
components of the engine and transmission
require a constant power source and will
continue to draw power when the disconnect is
engaged.
Turn the chassis battery disconnect switch
off when the motorhome is going to be stored
or when performing electrical maintenance. If
possible, leave the motorhome plugged into an
AC source with the chassis battery disconnect
switch on to help prevent the possibility of
dead batteries.
If an AC source is not available and the
motorhome is going to be stored more than 48
hours, it is recommended to turn the chassis
battery disconnect switch off.
WARNING
When welding is involved for
motorhome repair or modification,
only qualified, experienced technicians
should weld on the chassis. Improper
welding procedures and materials
may weaken the assembly or result in
damage that is not obvious and may
not cause an immediate problem or
failure. Unauthorized modifications or
repairs to the chassis could result in a
forfeiture of warranty coverage.
DANGER
Due to the sensitive nature of the
electronics on the chassis, the
following precautions are required to
protect electrical components in the
motorhome chassis:
1. Disconnect the (+) positive and (-)
negative battery connection.
2. Cover electronic control
components and wiring to protect
from hot sparks.
3. Disconnect the terminal plugs
from the engine Electronic Control
Unit, located on the curbside of the
engine block.
4. Disconnect all the plugs from the
transmission Electronic Control
Unit located in roadside front
electrical panel.
5. DO NOT connect welding cables to
electronic control components.
6. Attach the welding ground cable no
more than two feet from the part to
be welded.
BATTERY - cHASSIS
The chassis battery is designed to produce
high amperage necessary to start the engine.
Maintain the chassis battery through regular
electrolyte level inspections and hydrometer
readings. High electrolyte consumption or
inconsistent hydrometer cell readings may
indicate a charging system problem. Perform a
charging system and
current draw check
if the battery is
exhibiting abnormal
hydrometer
readings.
NOTE
Replacement
batteries should
have the same
cold cranking
amp (CCA)
rating.
FUSE & cIRcUITS
The motorhome relies on three electrical
panels to control chassis functions and some
house operated items.
The front electrical panel (also called the
front run box) is located in the roadside front
compartment and contains fuses, self resetting
manual reset supply circuit breakers, solenoid
and relays for many chassis and house related
functions. The front distribution box, located
under the front electrical panel, controls
front chassis functions. A rear distribution
box, located in a curbside rear compartment,
controls rear chassis functions.
060077c
Battery with cover removed.
Cut plastic to remove cover.
080460b
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