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14-6
GROUP 14- STARTING SYSTEM
FIG.
7
-Starter No-Load Test
on Test Bench
FIG. 8-Armature Grounded
Circuit Test
sometimes be detected by examining
the commutator for evidence of
burning. The spot burned on the
commutator is caused by an arc
formed every time the commutator
segment, connected to the open cir-
cuit winding, passes under a brush.
STARTER
TERMINAL
VOLTMETER
--.....:$.
POSITIVE
LEAD
J1094
-
B
FIG. 9-Field Grounded Circuit
Test
ARMATURE AND FIELD
GROUNDED CIRCUIT TEST-
ON TEST BENCH
This test will determine if the
winding insulation has failed, permit-
ing a conductor to touch the frame
or armature core.
To determine if the armature
windings are grounded, make the
connections as shown in Fig. 8. If
the voltmeter indicates any voltage,
the windings are grounded.
Grounded field windings can
be
detected by making the connections
as shown in Fig. 9. If the voltmeter
indicates any voltage, the field wind-
ings are grounded.
STARTER CRANKING
CIRCUIT TEST
Excessive resistance in the starter
circuit can be determined from the
results of this test. Make the test con-
nections as shown in
Fig.
lO.Crank
the engine with the ignition OFF.
This is accomplished by disconnect-
ing and grounding the high tension
lead from the spark coil and by con-
necting a jumper from the battery
terminal of the starter relay to the
ignition switch terminal(s), of the re-
lay.
The voltage drop in the circuit will
be
indicated by the voltmeter (o to 2
volt range).
Maximum allowable
voltage drop should
be:
1. With the voltmeter negative
lead connected to the starter terminal
and the positive lead
connecte~
to the
battery positive terminal (Fig.lO, con-
nection
<D)
• • •
•
• • •
• • • • • •
0.5 volt.
l.
With the voltmeter negative
lead connected to the battery termi-
nal of the starter relay and the posi-
tive lead connected to the positive
terminal of the battery (Fig. 10, con-
nection
®)
..
.. ..
.. ..
..
0.1 volt.
3. With the voltmeter negative
lead connected to the starter termi-
nal of the starter relay and the posi-
tive lead connected to the positive
terminal of the battery (Fig.lO, con-
nection
®) .
••
.......•.
.
.
0.3
volt.
4. With the voltmeter negative
lead connected to the negative termi-
nal of the battery and the positive
lead connected to the engine ground
(Fig.
9, connection<!>) .
.
.
.
0.1 volt.
@.•.......:"""""""'-
•
I
-
I
I
\
••
•• ••
J1259-1
FIG. 1 0 -Starter Cranking Circuit
Test
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