Pontiac TRANS AM 1977 Service Manual page 828

STARTER RUNS (SPINS), ENGINE DOES NOT CRANK
Check flywheel gear teeth. I f OK, starter is faulty.
STARTER KEEPS RUNNING WITH KEY "OFF"
Remove wire from "S" terminal of solenoid. I f
it
keeps
running, starter is faulty. I f
it
stops, check for a short i n the
wiring harness or defective ignition switch.
IGNITION MISS OR WILL NOT START (CRANKS OK)
Make secondary available voltage check on two or more spark
plug wires, using ST-125 spark gap or equivalent. HE1 system
should produce at least 25,000 volts (25KV) cranking or
engine idling. I f
it
does not, follow procedure below. I f
it
does, check spark plugs, spark plug wires, and distributor cap.
I f car will not start, make voltage checks below cranking. I f
it
-
will start, make them running.
VOLTS VOLTS
CRANKING IDLING
1. 6 t o G 7 or more 9.6 or more
Under 7
Under 9.6
2.4 t o G
7 or more
9.6 or more
Under 7 Under 9.6
3. 5 to G 7 or more 9.6 or more
Under 7 Under 9.6
LOW BATTERY, BUT GENERATOR LIGHT INDICATES
"NO PROBLEM"
Tighten or replace generator belt i f necessary.
Charge battery.
Run engine at 1,500 to 2,000 RPM for one minute with
lights on high beam, heater on high, radio and defogger
blower on.
1 t o G
Under 12.5 volts Faulty generator.
12.5 volts or more Check for battery
drain and driving
habits. I f no defect
is found, make generator
output check.
OVERCHARGING
1.
Run engine at 1,500 to 2,000 RPM, no load, for one
minute or until voltmeter reading exceeds 12.5 volts,
whichever occurs first.
Check HE1 unit.
1 t o G 15.5 volts or more Faulty generator.
Go t o test 2.
Check the HE1 unit.
I f OK, the wire
from connector
terminal # 6 t o HE1
is grounded.
Go to test 3.
Faulty lead or bulk-
head connection
from ignition switch
t o connector pin #4.
Replace ignition
switch.
GENERATOR WARNING LIGHT "ON" ENGINE RUNNING
Tighten or replace generator belt, if necessary.
Ignition switch "ON" engine stopped.
1. Light off Blown gauge fuse; determine cause.
Light on With engine running, remove two wire connector
from generator. If the light goes out,
generator is faulty. If light stays on, wire from
generator light t o generator #1 terminal is
grounded.
Under 15.5 volts check for extended
driving conditions
in hot weather.