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I
I
~
- NEG.A
TO' "
GROUND
AMMETER
STARTER
AND
IGNITION
5WHCH--/
~~
56x79
Fig
.
<1
-
Testing
Starling Molor Circuit Resistance
and
Current Draw
SERVICE
PROCEDURE
NO TE:
Before testing
the
stat'tcr,
the
battery
should be
tested. If
the buttery 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,
Starter
Circuit Resistance and Starter Current
Draw Test
Test the
circuit resistance and
the
starter
cur-
rent draw
at the same t
ime,
as shown
in
Figure
4.
Di
gcon
nect the battery lead from
the
posi-
tive b:'lttery
post.
Connect an 0 to
300
scale a
m-
meter
between
the
disconnected
lead
and the
positive battery terminal
post.
Connect a test
voltmeter
with
.lO-volt
scale
divisions
from
the
battery posit ive post to the starter
switch
ter·
minal.
Crank
the engine
and
observe
the readings
on
the
voltmeter and the
ammeter. The
voltage
should
not
exceed .12
volt
per
100
amper
es of
current.
T
he current shou
ld
not exceed
150
am-
peres. (Wa
rm
engine
and
battery.)
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 some
instances,
a short in the
starter
causes
a
voltage
leak.
A
cu rrent
that is high (150 amperes or more)
and is combined with low cranking
speed indi·
cates that the
startcr
should
be removed and
repaired.
A
cunent
that
is low
with
slow
crank-
ing
speed
indicates resistance in
the
starter,
such as
a
burnt comm
utator
and
wor
n brushes.
When
measuring the clearance between the
drive pinion and the drive end housing, press
in
on
the
solenoid
plunger
only.
The
clearance
should be
%2
inch (.078 to .125)
.
Adjust
by
screwing
the plunger
screw
in
or
out as re·
quired.
T
o
disassemble
the
starter
after
removal,
refer to
Figure
3
for
pr
oper arrangement
of
parts.
Bench
tests are made in the
same
manner
as
ou
tlined
in
the
D-15431
Service Manual.
Re-
fe
r
to
"Specifications" in this Manual
for
test
data.
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