391
DIA-ITD-001
01 Rev. 9/06
WIRING DIAGRAMS
Introduction to Diagram Usage
Introduction to Diagram Usage
Schematic
•
Power up diagram. Illustrates the circuitry involved
in getting the truck system to an operating mode
(e.g. interlock switches, relays, SCR systems etc.).
• Circuitry which stands alone and is separate from
truck operation is shown in block form with the pic-
torials detailing the circuitry (e.g. light package,
displays, wire guidance, freezer condition).
Pictorials
•
Terminal board and connector numbering on the
pictorials are in two classes; power unit and plat-
form. Power unit TB's and CA's are even 100's
(200, 400, 600 etc.) and platform TB's and CA's are
odd 100's (100, 300, 500 etc.). On manup trucks
(SP, TS, TSP etc.), odd and even 100's will be
present on the wiring diagrams. Man-down trucks,
which don't have a platform (stand-up rider, pallet
etc.), only even 100's will be present.
• Wiring starts at a central location (e.g. distribution
board) and wiring connection points are numbered
with the lowest number odd or even. The next wir-
ing connection point from the distribution board are
then numbered with the next group of 100's and so
on for each connection point removed from the
central location.
• Terminal board and connector numbering is se-
quential on each consecutive page. In this way a
wiring address giving a connector number or termi-
nal board number will indicate which direction to
look in the diagrams for the other end of the wire.
When wiring goes to a component and not a termi-
nal board or connector, a reference terminal board
is used and is shown with a dashed line box with
the reference terminal board number in parenthe-
sis. This terminal board will not appear on the truck
and only present as a wiring directory.
• Input/Output arrows may appear at terminal
boards and connectors. These indicate whether
what the wire is carrying is incoming or outgoing.
This is helpful when tracing the origin of the signal
or voltage.
• The truck has been sectioned with one page cov-
ering each section. When options affect the wiring
in a section, an additional page is added which du-
plicates wiring that is identical and adds the option
wiring. In this way only one page of the truck sec-
tion is required for the applicable truck configura-
tion.
• Wiring that is identified by color rather than number
will typically be a cable or wires with vendor com-
ponentry.
• Page titles, listed at the beginning of the electrical
diagrams, indicate the subsystem or section of
truck wiring that is covered by each page.
Crown 1991 PF8974-1 Rev. 9/06
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