PREVOST X3-45 2016 Maintenance Manual Download

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Section 06: ELECTRICAL

PA1593

1. GENERAL

DESCRIPTION

These X3-45 coaches use a dual voltage
system to obtain two different voltages (12 and
24 volts) for various electrical controls and
accessories. The main power source
incorporates two maintenance-free “Deka”
commercal batteries connected in parallel-
series. All batteries are kept uniformly charged
by means of a 100 amp battery equalizer
(standard), giving a maximum possible output
supply of 100 amps on the 12 volt system. Both
the 12 and 24 volt systems are controlled
through individual main battery relays. Two 28
volt self-regulated alternators are installed and
are belt driven from the engine, and can be
reached through the engine compartment doors.

1.1 WIRING

DIAGRAMS

A master wiring diagram of the electric circuits,
covering standard and optional accessories and
systems, is located in the technical publications
box. Usually, a separate wiring diagram page is
provided for each major function or system. In
some cases, more than one circuit may appear
on one wiring diagram page; when this occurs,
each circuit covered in this page is listed in the
wiring diagram index. Moreover, a circuit may
appear on several pages; in such case, the
number(s) at the extremity of the diagram title
will indicate the sheet reference number. Refer
to the

"Wiring Diagram Index

" to ensure that the

correct diagram is being used to trace the circuit
in question. In addition to the major functions
page reference, the wiring diagram index
contains the following information pages.

The Multiplexed Device Index,

The Arrangement-Harness drawing showing

the harnesses arrangement and harness
number on the vehicle,

Glossary,

Circuit number listing,

Circuit breaker code,

Connector code,

Diode number code,

Resistor number code,

Fuse code.

1.1.1 Using Wiring Diagrams

Three methods are used to

"work"

with electric

wiring diagrams.

Situation:

You have identified the defective part

(breaker, diode, relay, etc.), and you wish to
locate its corresponding circuit.

Problem:

Circuit breaker CB13 is released

(open circuit) and you don't know which circuit is
affected.

a) Refer to wiring diagram index, and look for

"Circuit breaker code"

. You find that the

circuit breaker list is on page

b) At item CB

13, you will find the location, the

Prevost number, the breaker function, the
breaker ampere rating and the page on
which to find the corresponding diagram.

c) Refer to page 3.1.

d) When you have located CB13, follow the

wiring up to the end and find the diagram
page number and function on which the
circuit continues.

Situation:

You have a problem with a specific

system and you want to find the corresponding
diagram.

Problem:

The last three (3) speakers on the

R.H. side of vehicle are inoperative and you
must trace the electric circuit.

a) Refer to wiring diagram index and look for

“Sound system”.

b) You will find on page 35.2 the components

as well as the electric wiring, thus providing
you with a complete understanding of this
circuit.

Situation:

Using the Driver Information Display

(DID), you check on arrival if there are active
errors in the vehicle electrical system. With the

Diagnostics

menu, highlight

Fault

Diagnostics

, highlight

Electrical System

request a diagnostic of the electrical system and
then press the enter key. If applicable, the DID
shows the fault messages or fault codes
recorded. When more than one fault is recorded,
an arrow pointing down appears on the right of
the display. Use the down button to see all the
fault messages.