Chevrolet 10 Series 1967, Service Manual

Page: 359 / 605

ENGINE-ELECTRICAL 6Y -11
8
. Run engine at 1500 rpm or above for at least 15
minutes of warm-up, then cycle regulator voltage
control (by disconnecting and re-connecting regula­
tor connector) and read voltage.
If voltage is 13.5 to 15.2, the regulator is okay.
a. Disconnect four terminal connector and remove
regulator cover. Then re-connect four terminal
connector and adjust voltage to 14.2 to 14.6
(Refer to Step
6
and fig.
6
c).
b. Disconnect four terminal connector and reinstall
regulator cover, then reinstall connector.
c. Continue running engine at 1500 rpm for 5-10
minutes to re-establish r e g u l a t o r internal
temperature.
d. Cycle regulator voltage by disconnecting and
re-connecting regulator connector. Read voltage.
A reading between 13.5 and 15.2 indicates a
good regulator.
CAUTION: Be sure four terminal regulator
connector is disconnected when removing or in­
stalling cover. This is to prevent regulator
damage by short circu its.
SYSTEM COMPONENT TESTS
DELCOTRON OUTPUT TEST
Ammeter Method
1. Disconnect the battery ground cable at the battery.
2. Disconnect the red wire at Delcotron battery
terminal and connect an ammeter in series between
the wire and terminal.
3. Connect a voltmeter from battery terminal to a
good ground on the generator.
4. Disconnect the F -R terminal connector at the
Delcotron.
5. Connect the jumper wire between Delcotron “ F ”
and battery terminals.
6
. Connect the battery ground cable at the battery.
CHEVROLET TRUCK SERVICE M ANUAL
7. Connect an adjustable carbon pile across the battery
posts.
8
. Start the engine and slowly bring the speed to 1500
RPM and at the same time adjust the carbon pile
load to hold the voltage at 14 volts.
9. Read the amperage and compare with a specifications
chart.
10. Turn off ignition, disconnect battery ground cable,
and remove all test equipment.
11. If the Delcotron meets the test specifications, the
problem is not in the generator.
12. If the Delcotron fails to meet the test specifications,
remove it and perform bench tests and make repair
needed.
DELCOTRON DIODE AND FIELD TEST (Fig. 9c)
NOTE: These tests will indicate good, shorted
F ig . 8 c —Ammeter Method Output Test Connections