Chapter
9
Electrical System
2. Battery
,
4LHA Serit
2.
Battery
2-1
Construction
Terminal
Battery
case
Negative
plate
-Separate
plate
"~-Glass
mat
Positive
plate
The
battery utilizes chemical action
to
convert chemical
energy
to
electrical energy. This engine
uses
a
fead acid
battery which stores
a
fixed amount
of
power
that
can
be
used
when required. After
use, the
battery
can be
recharged
and used again.
As
shown
in the
figure,
a
nonconductive container
is
filled
with
dilute sulfuric acid electrolyte. Lead dioxide positive
plates and lead dioxide negative plates separated
by
glass
mats are stacked alternately
in the
electrolyte. The positive
and
negative plates
are
connected
to
their respective
terminals.
Power
is
removed from
the
battery
by
connecting
the
load
across
these two terminals.
When
the battery
is
discharging,
an
electric current flows
from
the
positive plates
to the
negative plates. When
the
battery
is
being charged, electric current is
passed
through
the battery
in the
opposite direction
by
an external power
source.
2-2
Battery
capacity
and
battery
cables
2-2.1
Battery
capacity
Since
the
battery has
a
minimum capacity
of
12V,
70AH,
it
can
be used
for
100
~
150AH.
Battery capacity
minimum
12V
—
100AH
Battery capacity
standard
12V
—
120AH
Battery capacity
cold
weather
12V
—
150AH
Full
charged specific gravity
1.26
2-2.2
Battery
cable
Wiring must
be
performed
with
the
specified electric wire.
Thick,
short wiring should
be
used
to
connect
the
battery
to the starter,
(soft
automotive low-voltage wire [AV
wire]).
Using
wire other than
that
specified
may
cause
the
fol-
lowing troubles:
Wire thinner than specified
Single
conductor wire
Wire longer than specified
r
High
wiring resistance
r
Low
current
Faulty
starting
Open
circuit caused
by vibrations
Faulty
charging
Battery switch
The
overall lengths
of the
wire between
the
battery
(+)
terminal and
the
starter (B) terminal, and between
the
bat-
tery
(-)
terminal
and the
starter
(E)
terminal, should
be
determined according
to
the following table.
Voltage
system
Allowable
wiring
voltage
drop
Conductor
cross-
section
area
a
+
b
+ c
allowable
length
12V
0.2Vorless/100A
20mm
!
(0.0311
in.')
Up
to 2.5m
(98.43
in.)
12V
0.2Vorless/100A
40mm'
(0.062
in.')
Up
to 5m
(196.87
in.)
Note: Excessive resistance
in the key
switch circuit
(between
the
battery
and
start
[S]
terminals)
can
cause improper pinion engagement.
To
prevent this,
follow the wiring diagram carefully.
2-3
Inspection
The
quality
of
the battery governs the starting performance
of
the
engine. Therefore
the
battery must
be
routinely
in-
spected
to
ensure
that
it
functions perfectly
at
all times.
2-3.1
Visual
inspection
(1) Inspect
the
case
for
cracks, damage
and
electrolyte
leakage.
(2) Inspect
the
battery holder
for
tightness, corrosion,
and
damage.
(3) Inspect
the
terminals
for
rusting
and
corrosion,
and
check
the cables for damage.
(4) Inspect
the
caps
for
cracking, electrolyte leakage
and
clogged
vent holes.
Correct
any abnormal conditions found.
Clean
off
rusted
terminals
with
a
wire brush before reconnecting
the
bat-
tery cable.
9-3
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