PREVOST X3-45 2016 Maintenance Manual Download

Page: 102 / 459

Section 06: ELECTRICAL

PA1593

NOTE

Spare wires are identified by a wire
identification number and by the letters “SP”, to
designate “spare”.

1.4 CLEANING

CONNECTORS

When the pins and sockets of connectors
become dirty, clean them with a good quality
solvent containing HFC 134A refrigerant as its
active ingredient. HFC 134A has two qualities
that recommend it. First, it does not conduct
electricity and therefore, will not cause shorting
between connector pins and sockets. Second, it
evaporates quickly, eliminating the possibility of
condensation within the connectors.

Always shake out or gently blow out any excess
HFC 134A before assembling a connector to its
mating connector or hardware. HFC 134A
trapped in the connector can affect the
connector seal.

DANGER

HFC 134A is toxic. HFC 134A bases
compounds should always be used in a well-
ventilated area, never in a confined space.
Use outdoor whenever possible.

1.5 CIRCUIT

BREAKERS

Most electric circuits are protected by circuit
breakers of the “Manual Reset” type. The main
circuit breakers, as well as those protecting the
A/C system, are located on the rear electrical
junction panel and are accessible from the
engine compartment curb-side door, on R.H.
side of the vehicle.

This type of circuit breaker deenergizes the
circuit without disconnecting any wire.

1.5.1 X3-45

Coaches

Circuit breakers CB2, CB4 & CB6 are different
in the fact that you may open the circuit
manually, to do so simply press down the red
tab on breaker to open the circuit, repair
defective circuit, and afterwards depress black
button in center of breaker to close the circuit.

Smaller circuit breakers may be located in the
VECF of the front service compartment.

CIRCUIT BREAKERS

CB1

Front distribution

24 VI

90 amps

CB2

Distribution

12 VD

90 amps

CB3

HVAC - evaporator

24 VI

90 amps

CB4

Sound system

12 VD

30 amps

CB5

Rear distribution

24 VI

150 amps

CB6

Distribution

24 VD 70 amps

CB7

HVAC - condenser

24 VI

70 amps

CB8

Rear distribution

12 VI

40 amps

CB9

WCL or other option

24VD

50 amps

CB10

Front distribution

12 VI

70 amps

CB11

Sound system

24 VD

50 amps

CB13

Inverter

24 VI

90 amps

VD= volts direct. The electrical components
connected to these circuit breakers are direct-
connected to the battery.

VI= volts indirect. Electrical power is supplied
via master relay R1 which engages when
ignition key is in the ON or ACC position and
battery master switch (master cut-out) is set to
ON.

FIGURE 2: REAR ELECTRICAL JUNCTION PANEL

06621

1.6 MULTIPLEX

FUSES

The multiplex outputs are protected in current by
an internal “soft-fuse”. Each output has
programmed specific maximum amperage.
When an output is shorted, the current gets
above the limit and the soft-fuse intervenes to
turn the output OFF. The output stays OFF until
the "soft-fuse" is reset.
Turn the ignition switch to the OFF position and
turn to the ON position again. This resets all
"soft-fuses".
There is also hardware fuses used to protect the
incoming power to the multiplex modules. These
fuses are located inside the VECF (Vehicle