DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual Section 06 revised release October 2021
2. GENERAL DESCRIPTION
This vehicle uses a dual voltage system to
obtain two different voltages (12-volts and 24-
volts) for various electrical controls and
accessories. The main power source
incorporates four batteries connected in series-
parallel. 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 12V and 24V systems are controlled through
individual main battery relays. Base
configuration uses three 24V self-regulated
alternators, belt driven from the engine, and can
be reached through the engine compartment
doors.
This vehicle is equipped with PRIME energy
management system, which features AGM
batteries and a Vanner Vann-Bus 80 Series
battery equalizer.
2.1 WIRING DIAGRAMS
A paper copy of the 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.
2.1.1 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 CB5 is released (open
circuit) and you don't know which circuit is
affected.
a) Refer to wiring diagram index, and look for
"Circuit breaker list".
b) At item CB5, 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 CB5, 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’s Info Display (DID),
you check on arrival if there are active errors in
the vehicle electrical system. With the
DIAGNOSTICS menu, highlight VIEW ACTIVE
FAULTS, highlight ELECTRICAL to 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 arrow to see all the fault
messages.
Problem: DID displays the fault "Elec. Horn
SW63; shorted to ground" as being active.
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