Pontiac Fiero 1988 Service Manual page 402

CRANKING SYSTEM 6D2-9
T E S T I N G S E R I E S C O I L F O R O P E N
c. Using a test lamp, place one lead on the series coil ter-
minal and the other lead on the insulated brush. If the lamp
fails to light, the series coil is open and will require repair or
replacement. This test should be made from each insulated
brush to check brush and lead continuity.
T E S T I N G S E R I E S C O I L F O R G R O U N D
T H E S E TWO T E R M I N A L S
MUST B E S E P A R A T E D
d. On starters with shunt coil, separtate series and shunt
coil strap terminals during this test. Do not let strap terminals
touch case or other ground. Using a test lamp place one lead
on the grounded brush holder and the other lead on either
insulated brush. If the lamp lights, a grounded series coil is
indicated and must be repaired or replaced.
Fig. 805 Starter Motor
T E S T I N G S O L E N O I D W I N D I N G S
V O L T M E T E R
+
B A T T E R Y
e. Check the current draw of the solenoid winding as fol-
lows:
If solenoid is not removed from starting motor, the connec-
tor strap terminals must be removed from the terminal on the
solenoid before making these tests. Complete tests in a
minimum of time to prevent overheating of the solenoid.
To check hold-in winding, connect an ammeter in series
with 12-volt battery and the 'switch" terminal on the solenoid.
Connect a voltmeter to the "switch" terminal and to ground.
Connect carbon pile across battery. Adjust the voltage to 10
volts and note the ammeter reading. It should be 13 to 19
amperes for all starting motors.
To check both windings, connect as for previous test.
Ground the solenoid motor terminal. Adjust the voltage to 10
volts and note the ammeter reading. It should be 59 to 79 am-
peres for all starting motors.
N O T E : Current will decrease as windings heat up.
Current draw readings that are over specifications indicate
shorted turns or a ground in the windings of the solenoid and the
solenoid should be replaced. Current draw readings that are
under specifications indicate excessive resistance. No reading
indicates an open circuit. Check connections then replace sole-
noid if necessary.
H20255-6P
\ Test and Reassembly 4 of 6