I
I
~
- NEG.A
TO
'"
GROUND
AMMETER
STAR
TER
AND
IGNITION
5WHCH--/
~~
56x79
Fig
.
<1
-
Te
sting Starling Molor Circuit Resistance
and
Current Draw
SERVICE PROCEDURE
NO TE: Before testing the stat'tcr, the battery
should be tested.
If
the bu
ttery
tests 1.250 spe-
cific
gmvity
or
less, the
battery
should be placed
on
ehal'ge
and
fully
Tccitarged
be/moe
making
any starling motor tests,
St
arter
Circuit
Resistance
and
Starter
Current
Draw
Test
Test
the
circuit
resistance and
the
start
er
cur-
rent
draw
at
the
same time,
as
shown
in
Figure
4.
Di
gcon
nect
the
battery
lead
from
the posi-
tive
b:'lttery post. Connect
an
0 to 300 scale am-
meter
between the disconnected lead
and
the
positive
battery
terminal
post. Connect a
test
voltmeter
with
.lO-volt
scale divisions
from
the
b
attery
positive p
ost
to
the
starter
switch
ter
·
minal.
Crank
the engine
and
ob
serve
the
readings
on the
voltmeter
and
the
ammeter.
The voltage
should not exceed .12 volt per 100
ampe
res of
current.
The
current
shou
ld
not exceed
150
am-
pere
s.
(Wa
rm
engine
and
ba
ttery.)
29
A I'eading of voltage
that
exceeds .12-volt per
100
amperes
indicates
that
there
is high resist-
ance caused by a loose
circuit
connection, de-
fective cable,
burnt
switch contact.'i and, in
so
me
ins
tan
ces, a
short
in the
starter
causes a voltage
leak.
A cu
rren
t
that
is high (150
amperes
or
more)
and
is combined
with
low
cranking
speed indi·
cates
that
the
startc
r should be removed
and
repaired. A
cunent
that
is low
with
slow
crank-
ing speed indicates
re
sistance in the
starter,
such
as
a
burnt
commu
tator
and
worn brushes.
When
measuring
the clearance between
the
drive
pinion
and
the
drive
end housing,
press
in on the soleno
id
plunger
onl
y.
The clearance
should be
%2
inch (.078 to .125) .
Adju
st
by
sc
rewing
the
plunger
screw in or
out
as
re·
quired.
To di
sassemb
le
the
s
tarter
after
removal,
refer
to
Figure
3 for proper
arrangement
of
parts.
Bench
tests
are
made
in
the
same
manner
as
outlined in the D-15431 Service Manual. Re-
fer to "Specifications" in
this
Manual
for
test
data.
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