FROM ALT:RNATOR
TO
KEY
swlTcH
TRIGGER MODULE
Figure
9
-
Wiring Connection
Detqil
on Trigger
Module
ETECTRICAL SYSTEM
Storage ba*eries are of the lea&acid
type. Lead
is
used in
the construction of the
cellplates
and sulfuric
acid serves
as tle electrolyte. With
*dry
charged"
batteries,
the
plates
are
charged
but
an electrolyte of
speciffc
grade
must
be added
iust
before using.
All trirctors use negative
ground
systems
in
which the negative
(-)
terminal of the battery is connected
in
common
ground
to
the
engine while
the positive
(f)
terminal is the
"live"
terminal.
When
disconneeting battery
always remoye
ground (-)
terminal
ffrst.
Voltage
Test:
With a
battery
in
good
condition, each cell contributes approximately 1.95
to
9.6
volts.
If less
than 0.05 volt
difference is noted between the highest and
lowest
cells, the
bnttery
may
he
recharged.
IJ the
dif-
ference
is more than
0.05
volts,
this could indicate
a
cracked
plate
or other damage rvhich could call
for replace-
rnent of
the battery.
Spciffc
Gravity
Testr As
a battery discharges
and the energy is not
replenished,
sulfuric acid
is chemically
with-
drawn
from
the
electrolyte
and Iead sulfate
deposits continue to build up on the
plates.
This
results
in
a
diminish-
ing speciffc
gravity
of the electrolyte. If the speei*c
gravity
drops below
1.240, the battery
must be
r€charged.
In
fully
charged eondition,
the
speeiffc
gravity
will be
in the 1.260-1.280 range. Hydrometer readings
must
be cs:-
rected
for variation
in
temperature of electrolyte.
Add
.004
to the
reading
for every 10"
above 80oF.
and
subtract
.0O4 for every 10e
below 80oF.
As a battery
is
recharged, o reverse chemical
reaction
takes
place
which
causes
the lead
sulfate deposits
to
be
changed back to
lead, Iead
dioxide and sulftrric
acid.
In
effect, this reverses the discharge reaetion
and
re-
stores materials to active
condition. If sulfate
deposits
become too
great
or
if the level of
the electrolyte
is not
maintained
above the Ievel
of the
plates,
the
battery may be
permanently
damaged.
r(
tu
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