Ford COUGAR 1968 Shop Manual page 610

1 4 - 4
,: ; : GROUP 14,-
Starting System
windings, rubbing armature, and bent
armature shaft. The starter' can be
tested, at no-load, on#the test bench
only.
,
Make the test connections as shown
in Fig. 5. The starter will run at no-
load. Be sure that no current is flow-
ing through th'e ammeter (rheostat at
maximum counterclockw~;e position).
Determine the exact reading ?n the
voltmeter.
Disconnect the starter from the
battery, and reduce the resistarice of
the rheostat 'until the *voltmeter in-
dicates the same reading as that ob-
tained while the starter was running,
The ammeter will indicate the starter
no-load current draw.
POSITIVE
LEADS
JUMPER $LEAD
K F F P R O T H
VOLTMETER V O L T M m R
-4
NEGATIVE POSITIVE
LEAD
'
LEAD' J1094-D
FIG. 5 L S t a r t e r No-Load Test on
FIG. 7-Field
Grounded Circuit Test
ARMATURE OPEN CIRCUIT
Test Bench
TEST-ON TEST BENCH
An open circuit armature may
sometimes be detected by examining
the commutatdr'for evidence of burn-
ing. A spot burned on the commuta-
tor is caused by an arc formed every
time the commutator segment, con-
nected to the open circuit winding,
passes under a brush,.
.
ARMATURE A N D FIELD
GROUNDED CIRCUIT 'TEST-
ON TEST BENCH
This test will determine if the wind-
ing insulation has failed, permitting a
conductor to touch the frame or arma-
ture core.
To determine if the armature wind-
ings are grounded, make the connec-
tions as shown in Fig. 6. If the volt-
'
D O N O T CONNECT
.
.
LEAD TO BEARING
NEGATIVE LEAD
VOLTMETER POSITIVE LEA
TOUCH T O COMMUTATOR
- C
FIG. 6 - ~ r m a t " r e Grounded
circuit Test
'
FIG. 8-Starter
Cranking Circuit
-
Test
41.
-
FIG. 9-Starter
Sys#emksobte-Diagnosis Guide . .
-
. . , . .
-
.
i
STARTER WILL N O T
CRANK ENGINE
ENGINE CRANKS SLOWLY
BUT WILL N O T START
1. Battery low in charge.
8.
Defective neutral start switch
2. Defective battery.
(ifused).
.
-
3. Corroded battery cables or 9. Defective ignition switch.
connections.
10.
Defective wiring from igni-
4.
\Defective starter relay.
-
tion switch through neutral start switch
5. Defective starter drive. (if used), to starter relay.
6.
Defective starter. 11. Hydrostatic lock.
7. Maladjusted neutral start switch
12.
Engine has seized pistons or
(if used).
-
,-
bearings.
-
+
1.
Battery low in charge.
.
5. Incorrect viscosity engine oil
2.
Defective battery.,
-
in crankcase.
3. Corroded battery cables.
6.
Pistons or bearings partially
4.
Defective starter.
i
*
seized.
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