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Home > Ordnance Documents and other related manuals > > Terminal Board Enclosure
Part C- Tracing Electrical Circuits
Power Distribution Box Enclosure.

Wiring Diagrams, M1A1 Tank
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wire to go to the terminal board and you find the other symbol
for an electrical connection.  The three lines join at a solid
circle,  the  other  symbol  for  an  electrical  connection.
Remember,  when  electrical  lines  cross  and  they  do  not
intersect at a clear or solid circle, no electrical connection
exists.
The same holds true for the negative connections.  Look at the
negative connections for 2BT104 through 2BT106; the lines go
to a clear circle.  Follow the three negative lines off these
connections to where they join into one wire to go to the
terminal  board,  and  you  find  the  other  symbol  for  an
electrical connection.  These three lines also join at a solid
circle.

Terminal Board Enclosure.
Looking at the diagram, you find
the positive wires off the batteries go to 2TB152 and the
negative wires go to 2TB151.  What other information can you
obtain from this enclosure? If you examine further, you find
the lugged ends of wire harness 2W154/5 attach to the terminal
boards, using connections E9, E10, E7, and E8.

Wire Harness 2W154/5.  This wire harness connects the terminal
boards to the power distribution box.  When you examine this
schematic,  you  should  have  no  difficulty  determining  the
following:
--
Type of cable.
The solid oval around the wires to pin
connectors B and D, and A and C indicates the wire has a
non-shielded outer coating.
If the wire harness has a
broken oval around it, that broken oval indicates that the
wire harness has a shielded outer coating.
--
Gender of pin connectors and number of connectors the wire
harness has.
Examine the end of the wire harness just
before it connects to the power distribution box.
The
diagram  clearly  indicates  that  the  pin  connectors  are
female.
It  also  shows  the  pin  designations  in  the
connector (e.g., A, B, etc.).
Also, the diagram shows
this wire harness has two connectors identified as P1 and
P2.

Power Distribution Box Enclosure.  The enclosure lines enclose
all the components that mount inside the power distribution
box, thus providing you with information about the components
and circuits inside the power distribution box.
12
OD1706






Western Governors University

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