Hummer H1 Service Manual page 807

12-36 Electrical System
MEASURE CLEARANCE
HERE WITH FEELER GAUGE
PINION HOUSING
Figure 12-69: Starter Pinion Clearance Measurement and Adjustment
Starter Test
1. Connect voltmeter, ammeter, switch and battery to starter
as shown (Figure 12-70).
CAUTION: Do not operate the starter motor for more than 10
seconds at a time. Allow the starter motor to cool at least 2
minutes between tests to avoid overheat damage.
WARNING: Starter must be secured to prevent move-
ment from start up torque. Test cables must be of a suf-
ficient gauge size to conduct starter current.
2. Close switch, adjust voltage to 9.5 volts on voltmeter
using carbon pile. Check rotating speed of armature with
tachometer. Read current draw on ammeter.
3. Maximum current draw should be 65 amps with a
minimum armature speed of 5000 rpm. If a low speed,
high current condition exists, check armature for shorts or
grounds. If a low speed, low current draw exists, inspect
starter motor for bad connections or poor brush contact.
4-1-00
_______________________________________________________
ARMATURE SHAFT
ADD OR SUBTRACT
THRUST WASHERS TO
ADJUST CLEARANCE
SWITCH
VOLTMETER
CARBON
PILE
12 VOLT
BATTERY
Figure 12-70: Starter Test Connections
®
END
PLATE
STARTER
MOTOR
AMMETER