Chevrolet 70 1969 Series, Shop Manual

Page: 399 / 913

ENGINE ELECTRICAL 6Y-28
TWO-UNIT TYPE REGULATOR
(MODEL 1119507 OR 1119515)
GENERAL
The two-unit type voltage regulator is used on
all models equipped with the 42- or 61-amp
generating system. Operation of regulator and
other affiliated generator system units is explain­
ed previously under "Generating System General
Description."
R E M O V A L
1. Disconnect the negative battery cable from
battery.
2. Carefully lift up on regulator wiring harness
connector with one hand and with the other, pull
harness connector from regulator.
3. Remove regulator mounting screws, then
remove regulator assembly.
REGULATOR REPLACEMENT
N O T E : On conventional cab models the voltage
regulator is mounted on engine side of dash panel.
On steel and aluminum tilt cab models the regula­
tor is mounted on the radiator front support or on
the transmission control island front support.
Figure 12— Regulator with Cover Removed
IN S T A L L A T IO N
I M P O R T A N T : Make sure one battery cable is
disconnected from battery.
1. Place regulator-to-generator ground wire
(if used) on regulator mounting and install regula­
tor attaching screws.
2. Lift up on regulator terminal latch and in­
sert wiring harness connector over regulator term­
inals.
IM P O R T A N T : Make sure connector is fully
engaged over terminals and locked in position.
Check by attempting to pull connector apart.
3. Connect battery cable to battery terminal.
GENERAL INSPECTION
With the regulator assembly on work bench,
remove the cover (fig. 12) and inspect various
compartments, connections, and contact points for
signs of damage.
VOLTAGE REGULATOR UNIT CHECK
C L E A N IN G C O N T A C T PO IN T S
If the contact points are dirty or oxidized,
they must be cleaned before any adjustments are
made since the cleaning may change the mechan­
ical settings. The upper contacts may develop
slight cavities. These surfaces should be cleaned
to bare metal with #400 silicone carbide paper
Figure 13— Adjusting Point O p ening Figure 14— Adjusting Air Gap
CHEVROLET SERIES 70 -80 H EAVY DUTY TRUCK S H O P M A N U A L