4-09
CHARGING
4-09
TESTING (Continued)
Load Test
1. With the engine running, turn the heater or air
conditioner blower motor on (high speed) and
headlights on high beam.
2. Increase the engine speed to approximately
2000 RPM. The voltmeter should indicate a
minimum of 0.5 volt above the base voltage. If
not, perform the Under Voltage Tests de-
scribed below.
if the above tests indicate proper voltage read-
ings (l/2 volt open circuit above base), the charg-
ing system is operating normally. Proceed to the
tests below if one or more of the readings are
different than shown above and use a test light to
check for battery drain.
Over Voltage Tests
1. If the voltmeter reading indicates more than
2.0 volts above base voltage, connect a
jumper wire between the regulator base and
alternator frame. Repeat the No Load test. If
over voltage condition disappears, check
ground connections on alternator, regulator
and from engine to firewall and to battery.
Clean and tighten connections securely.
2. If over voltage condition still exists, disconnect
the regulator wiring plug from the regulator
and repeat the No Load test.
3. If over voltage condition disappears (volt-
meter reads battery base voltage), replace
voltage regulator.
4. If over voltage still exists with the regulator
wiring plug disconnected, check for short be-
tween “A” and “F” in the wiring harness plug
and service as required. Replace the reg-
ulator and connect the regulator wiring plug to
the regulator.
Under Voltage Tests
1. If the voltage does not indicate more than l/2
volt above base voltage, disconnect wiring
plug from regulator and connect an ohmmeter
from “F” terminal of plug to ground. Meter
should indicate more than 2.4 ohms. If less
than 2.4 ohms is indicated, service grounded
field current in wire or alternator and repeat
Load Test above.
2. If ohmmeter indicates more than 2.4 ohms
connect jumper wire from “A” to “F” terminals
of regulator plug. Repeat Load Test above. If
voltmeter now indicates more than l/2 volt
above base voltage, service wiring to reg-
ulator or regulator.
3. If the voltmeter still indicates under voltage,
remove the jumper wire from the regulator
plug and leave the plug disconnected from the
regulator. Connect a jumper wire to the FLD
and BAT terminals on the alternator and re-
peat the Load Test. If the voltmeter now indi-
cates more than l/2 volt above the base
voltage, perform S and I Circuit Test and ser-
vice the wiring harness from the alternator to
the regulator.- .
4. If the voltmeter still indicates under voltage,
stop the engine and move the positive volt-
meter lead to the alternator BAT terminal.
5. If the voltmeter now indicates the base volt-
age reading, service the alternator. If the volt-
meter indicates zero volts, service alternator
to starter relay wire.
A LOWER
READlNG
INDICATES A
METER SHOULD INDICATE BETWEEN
4
AND 250 OHMS
SHORTED OR
GROUNDED
FIELD CIRCUIT
(INCLUDING
II i-A===?& !I
ALTERNATOR)
I
USE
TER
B9A
FRO
KIT NO. B9A-14294-PAK
IN REGULATOR PLUG.
J1633-10
I
TO CONNECT “A” AND “F” TERMINALS
AT REGULATOR PLUG
J1635-1 A
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