ELECTRICAL SYSTEMS - HOUSE — 8
168
20 08 CONTESSA
Multiplex
The Multiplex system
consists of fuse modules and
switches located throughout
the motorhome. The fuse
modules are located with the
AC Breaker Panel, which
is typically located in the
bathroom.
The Multiplex is a
communications and
switching system. When
a switch is pressed,
information is gathered
through the remote
modules and is directly
communicated to the
Multiplex Control Master.
The Multiplex Control Master then interprets
the inputs, determines the state of all outputs
and communicates that information to operate
the selected component.
Troubleshooting:
Battery cut-off switch must be on.
If a switch is pressed and the
backlighting does not turn on, check
the 10 Amp fuse in the 12 Volt DC
distribution panel. Also check the 5 Amp
fuse located Multiplex Control Master.
If the backlighting turns on and the
yellow communication LED illuminates
but the item does not turn on, check the
fuse for that circuit.
FUSES & CIRCUIT BREAKERS – 12 VOLT DC
Circuit protection devices are installed to
protect circuit wiring in case an over-current
condition occurs. An over-current condition
usually falls into one of two categories, a short
circuit or overload. A short circuit is when a
break or fault in the circuit allows electricity
to ow directly to ground. Circuit overload is
when circuit amperage or the electrical load
exceeds designed operating parameters.
Several factors are considered when designing
a circuit to operate an electrical load. The
amperage required to operate the electrical load
will determine wire size and wire insulation
type. The application of the electrical load can
be a factor whether a fuse or circuit breaker is
selected.
Circuit protection devices come in a variety
of shapes and ratings. Most common are the
blade style plug in fuse and auto reset circuit
breakers. These types of circuit protection
devices are readily available from auto supply
stores. Circuit protection devices in a 12 Volt
DC system are actually rated at 32 Volts DC
due to voltage variances in a 12 Volt DC
system. Replacement devices must use the
same amperage rating and be of the same type
as the original for proper circuit protection and
electrical safety.
Generally a fault exists in the circuit when an
over-current condition has caused a fuse to blow
or circuit breaker to trip. Until the condition that
caused the fault is corrected replacing the fuse
may be a temporary x. Continually replacing
the fuse or circumventing the protection device
can jeopardize safety and circuit integrity.
WARNING:
Replacement fuses or circuit breakers
must be of the same type and rating
as the original equipment. Installing
protection devices other than the
original type and rating creates a safety
hazard potentially resulting in circuit
and/or component damage and fire.
Fuses:
The blade fuse
comes in three sizes:
Mini, Standard and
Maxi. Fuse color
determines amperage
ratings. A blown fuse
indicates an over-
current condition has
occurred.
ATC Fuse
060086B
060288b
Multiplex Modules
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