Opel 1900 1973 Service Manual page 33

Condition
The cranking motor keeps
on rotating after ignition
switch is off.
The drive pinion does not
been cranked.
STARTING SYSTEM CHECKS
Voltage Loss Checks
When the starter cranks too slowly, check the bat-
tery state of charge and all electrical connections
between the battery
and starter.
1. Turn on headlights and opera'te starter. If head-
lights dim considerably when starter is engaged, the
battery may be discharged or be defective. Check the
battery.
2. If the headlights stay bright but the starter d&s
not turn over, the starter cables may be faulty or the
starter defective.
(a) Test battery voltage while cranking engine 1(9
volts minimum).
to starter frame while cranking engine.
3. The difference in readings taken in Operations 2a
and above represents the volt& drop through the
2b
cables and solenoid switch. Voltdge drop should Got
exceed .5 volt.
4. Locate excessive resistance as follows:
(a) Turn voltmeter to scale above 12 volts and con-
nect voltmeter leads across connection or switch: to
be checked.
(b) With starter switch closed, turn voltmeter switch
to lowest scale and take reading as quickly as possi-
ble, then turn switch back to higher scale and stop
cranking engine.
4. Voltage drop.
5. Overrun&g clutch slips.
1. Ignition {witch does not
cut off or solenoid switch
sticks.
1. Drive pinion or ring gear
teeth clogged or flattened.
Return spring slack or broken.
(c) Voltmeter must not read more than .2 volt across
any c:onnection.
the d~efect
Starter Current Draw - Lock Test
1. Make sure battery is fully charged and in good
condition.
2. Connect a volt ampere starter tester according to
manufacturer's instructions.
3. Pull parking brake on securely, shift transmission
into 4th (direct) gear and actuate starter. (Starter will
not t,urn engine because engine is locked through
transmission.)
4. While starter is actuated, read voltage and current.
Refer to Specification Chart.
(a) Voltage low _ poor battery or a voltage loss in the
starter circuit.
(b) Current high - short circuit in starter. Overhaul
starter.
(c) Current low - commutator dirty, brushes worn,
solenoid switch contacts defective or open circuit in
starter. Overhaul starter.
Starter Current Draw. On Car
1. Bring engine to normal operating temperature.
2. Stop engine and disconnect coil wire from dis-
tributor.
3. Ground coil wire to prevent excessive coil voltage
build up.
Correction
1. Check wiring and wiring
connections.
1. Replace overrunning clutch.
motor cable from battery. Inspect
and/or replace or repair ignition and
solenoid switches as required.
Replace as required.
If voltmeter reads more than .2 volt,
must be corrected.