Engine Electrical; Cranking Circuit; Remove From Car - Pontiac Grand Prix Service Manual

ENGINE ELECTRICAL
NOTE: Information pertaining t o chassis electrical will be found in Section 12.
CONTENTS OF THIS SECTION
SUBJECT PAGE SUBJECT PAGE
. . . . . . . . . . . . . . .
Cranking Circuit . 6 E - 1
Starting Motor
. . . . . . . . . . . . . . .
. 6 E - 1
Charging Circuit
. . . . . . . . . . . . . . .
. 6 E - 6
. . . . . . . . . . . . . . . . . .
Generator . 6 E
-
10
. . . . . . . . . .
CSI Generator Regulator
. 6 E
-
14
Standard and Transistor Regulator
. . . . .
6E-14
CRANKING CIRCUIT
STARTING MOTOR
PERIODIC SERVICE
No periodic lubrication of the starting motor or
solenoid required. The motor and brushes cannot be
inspected without disassembling the unit, so no service
is required on the motor or solenoid between overhaul
periods.
CHECKS AND ADJUSTMENTS ON CAR
Although the starting motor cannot be checked against
specifications on the car, a check can be made for
excessive resistance in the cranking circuit. To check
for excessive resistance in the cranking circuit, mea-
sure:
1.
The voltage drop, during cranking, between the
positive battery post and battery terminal of solenoid.
2. The voltage drop, during cranking, between the
battery terminal of solenoid and the motor terminal of
solenoid.
3. The voltage drop, during cranking, between the
negative battery post and the starting motor frame.
CA UTION: To prevent the engine fiom jring during
the above checks, disconnect the primary lead to the
distributor at the coil.
If the voltage drop for any one of the above three
checks exceeds 0.2 volt, excessive resistance is indicated
. . . . . . . . . . . . . . . . .
Ignition Circuit 6E-14
. . . . . . . . . . . . . .
Distributor 6-Cyl. 6E-14
. . . . . . . . . . . . . . . .
Distributor V-8 6E-16
. . . . . . . . . . . . . . . .
Ignition Timing 6E- 19
Ignition and Starting Switch
. . . . . . . . .
6E-20
Spark Plugs
. . . . . . . . . . . . . . . . . .
6 3 - 2 2
terminal of the solenoid. Excessive resistance in the
solenoid control circuit is indicated and should be
corrected if the voltage drop exceeds 3.5 volts.
If the voltage drop does not exceed 3.5 volts and the
solenoid does not pull in, measure the .voltage
available at the switch terminal of the solenoid. If the
solenoid does not feel warm, it should pu1l"in
whenever the voltage available at the switch terminal
is 7.7 volts or more (when the solenoid feels warm, it
will require a somewhat higher voltage to pull in).
REMOVE FROM CAR
-
6-CY&. ENGINE
1. Disconnect battery ground cable at battery terminal
post.
2. Disconnect battery positive cable and wiring harness
leads from starting motor solenoid.
3. Remove starting motor.
REMOVE FROM CAR
-
V-8 ENGINE
1. Disconnect battery to starting motor cable from
battery post.
2. Raise front of car and place car stand under front
suspension.
3. Pull battery cable and solenoid wire loom down so
they hang free of surrounding parts.
4. Remove starting motor mounting screws and
remove starting motor with cable and solenoid wire
loom.
in that portion of the cranking circuit being checked.
Locate and eliminate the cause for any excessive
5. Remove wires from solenoid and cable from clamp
voltage drop in these circuits in order to obtain
or solenoid bracket.
maxikum ehciency of the cranking system.
SOLENOID
When the solenoid fails to pull in, the trouble may be
due to excessive voltage drop in the solenoid control
REMOVE AND REPLACE
circuit. To check for this condition, close the starting
switch and measure the voltage drop between the
battery terminal of the solenoid and the switch 1. Disconnect field strap.