Voltage Setting - Chevrolet 10 Series 1968 Service Manual

DO NOT TURN THIS NUT
UNDER ANY CONDITION
6. Turn on high-beam headlights and heater blower
motor to high speed, run engine at or above 1500
rpm (for a few minutes, if necessary) and read the
voltage on meter.
NOTE:
Voltage will not greatly exceed 12 1/2
volts until the battery develops a surface charge,
a few minutes generally, unless the battery is
severely discharged or is hot.
If reading is:
a. 12 1/2 volts or more, turn off electrical loads,
stop engine and proceed to Step 7.
b. Less than 12 1/2 volts, perform "Delcotron Out­
put Test-Voltmeter Method."
(1) Delcotron tests bad - refer to "Service Op­
erations" and repair Delcotron, then repeat
Step 6.
(2) Delcotron tests good - disconnect regulator
connector, remove regulator cover and re-
A D JU STIN G SCREW
(Turn To Adjust

Voltage Setting)

Fig. 5 c —Adjust Voltage Setting
ADJUSTING REGULATOR VOLTAGE
7. Connect a 1/4 ohm-25 watt fixed resistor (purchased
F ig . 6 c —V o ltage Setting Test Connection
connect the connector.
and turn voltage adjusting screw (fig. 5c) to
raise setting to 12 1/2 volts. On transistor
regulator remove pipe plug (fig. 5c), insert
screw driver into slot and turn clockwise one
or two notches to increase setting. Turning
counter-clockwise d e c r e a s e s setting. For
each notch moved, the voltage setting will
change approximately .3 volt. Turn off loads,
stop engine and proceed to Step 7. If 12 1/2
volts cannot be obtained, install a new regu­
lator and repeat Step 6.
commercially) into the charging circuit at horn relay
junction block as shown in Figure 6c.
NOTE:
Between both leads and the terminal.
ENGINE-ELECTRICAL 6Y -11
Then repeat Step 6
CHEVROLET TRUCK SERVICE MANUAL