03-06-9
Starting System
03-06-9
DIAGNOSIS AND TESTING (Continued)
Starter Drive Pinion Test
1 . Remove starter motor as described.
2. Disassemble starter drive { 1 1350) from starter
motor as described.
3. Turn the starter drive pinion by hand and hold the
overrunning clutch. Replace the starter drive if
the pinion turns in both directions or does not turn.
PINION
J
458
1
-
A
Armature-Open Circuit Test
An open circuit starter motor armature { 1 1 005) may
sometimes be detected by examining the commutator
for evidence of burning. A burn spot on the
commutator is caused by an arc formed every time the
commutator segment, connected to the open circuit
winding, passes under a brush.
Armature-Grounded Circuit Test
This test will determine if the winding insulation has
been damaged, permitting a conductor to touch the
starter frame and magnet {1 1075) or armature core.
To determine
if
the armature windings are grounded,
check with a multimeter. Infinite resistance indicates a
normal condition.
ROTUNDA
73
DIGITAL
MULTIMETER
1 05-R0051
Starter Solenoid
Make sure that the starter solenoid is isolated
electrically from the starter motor. Check for
continuity between solenoid S-terminal and solenoid
M-terminal, and between 8-terminal and ground
{starter frame and magnet). If there is no continuity,
the following conditions may exist:
•
Open wire; replace starter solenoid.
•
Ice, dirt or other foreign material preventing contact;
service as necessary.
J3390-A
Solenoid S-Terminal Circuit Resistance
Check the resistance of the entire 8-terminal circuit,
including all the switches, wires and connections.
Resistance should be less than 0.08 ohm.
Solenoid M-Terminal
1 . Check for continuity between the starter solenoid
M-terminal and the starter solenoid housing.
2. If there is no continuity, replace the starter
solenoid.
ROTUNDA 73 DIGITAL
MULTIMETER
105.-R0051
STARTER
SOLENOID
1 1390
AJ0138-A
1997
Thunderbird, Cougar July
1 996
