GMC T Series 1994 Repair Manual page 584

Grounds (SD-260)
13. Field coils for shorts.
• Shorts are indicated by poor motor performance
after everything else has been checked out. On
the SD-210 and SD-260 starter motors, the
coils cannot be replaced separately because of
the integral frame construction. The frame and
field assembly must be replaced. To replace the
field coils on the SD-300, a pole shoe spreader
and pole shoe screwdriver should be used. Use
care when replacing the field coils to prevent
grounding or shorting them as they are tight­
ened into place.
14. Drive assembly (clutch) by turning the drive pinion
in the cranking direction.
• If the drive pinion turns roughly or slips in the
c ra n k in g d ire c tio n , re p lace the co m plete
over-running clutch assembly.
15. Solenoid for grounds using a self-powered 12 volt
test lamp (figure 16).
A. Connect the test lamp between the BAT termi­
nal and the case. The lamp should not light
(terminal should not be grounded).
B. Connect the test lamp between the " S" terminal
and the case. Then connect the test lamp
between the " M" terminal and " S" terminal or
" M" terminal and the case. The lamp should
light.
C. If the solenoid does not pass these checks,
replace it.
16. Hold-in winding and pull-in winding.
A. With all the leads disconnected from the sole­
noid, make the test connections as shown in
figure 17.
NOTICE: To prevent overheating the pull-in
winding, do not leave the winding energized
more than 15 seconds. The current draw will
decrease as the winding temperature
increases.
B. Turn the switch orf and adjust the carbon pile to
lower the battery voltage to the value shown in
" Specifications" at the end of this section.
3. Solenoid
22. Battery
23. " S" Terminal
24. " M " Terminal
25. " BAT" Terminal
26. Voltmeter
27. Ammeter
29. Switch
30. Carbon Pile
A. Checking Solenoid Pull-in W inding
B. Checking Solenoid Hold-in W inding
F4222