ENGINE AND ENGINE REBUILDING 81
"F" TERMINAL NO. 2
TERMINAL NO. 3
TERMINAL NO. 4
TERMINAL
Type Two voltage regulator
which protect the system from transient volt-
age which may occur. The Type Two regula-
tor is easily identified by the finned regulator
casing.
The third type of regulator, hereafter called
Type Three, is mounted inside of the Delco-
tron alternator. This electronic regulator, used
in some 1969 and all later Corvettes, is non-
adjustable and must be replaced if defective.
REMOVAL
AND
INSTALLATION
Types One and
Two
1. Disconnect the negative battery cable
at the battery.
2. Disconnect the wiring harness from the
regulator.
3. Remove the regulator mounting screws
and remove the regulator.
4. Installation is the reverse of the pre
vious steps. Be sure that the regulator base is
properly grounded and do not overtighten the
mounting screws, as this will cancel the cush-
ioning effect of the rubber grommets.
Type Three
1. Remove the alternator from the vehicle
as previously outlined.
2. Scribe a line on the alternator case from
front-to-rear which will aid in attaining the
proper relationships between components
during assembly.
3. Remove the four through-bolts which
join the end frame assemblies.
4. Separate the end frames by carefully
prying between the drive (front) end frame
and the stator. DO NOT pry between the slip
ring (rear) end frame and the stator. The sta
tor is wired to the rectifier bridge which is
attached within the rear end frame.
5. Disconnect the three stator wire termi
nals at the rectifier bridge connections.
6. Remove the stator from the slip ring end
frame. It may be necessary to carefully pry
the stator from the frame.
7. Remove the three screws which retain
the brush holder and regulator. Note the po
sitions of the two screws which are equipped
with plastic insulating washers—these screws
MUST be installed in their original locations.
NOTE:
Some alternators also have a resis-
tor which is installed between the regulator
and brush ground terminals. Note its posi-
tion and reinstall it in the same manner.
8. Lift the brush holder and regulator out
of the alternator frame.
9. The regulator is installed in the reverse
of the previous steps. Before installing the
brush holder, push the brushes into the
holder and insert a straightened paper clip
through the holes provided in the holder for
brush retention. Remove the paper clip after
the alternator is assembled.
VOLTAGE ADJUSTMENT
Types One and Two Only
The adjustment procedure is the same for
both types of regulators, except for the loca-
tions where the adjustment is made. On the
Type One regulator, the adjustment screw is
under the regulator cover; the Type Two reg-
ulator is adjusted externally after removing
the alien screw from the adjustment screw
access hole.
1. Insert a % ohm-25 watt fixed resistor
into the charging circuit at the horn relay
FIELD RELAY
"LATCH"
"F" TERMINAL
f
NO. 2 TERMINAL NO. 3
TERMINAL NO. 4
TERMINAL
Type One voltage regulator
ACCESS PLUG TO
VOLTAGE ADJUSTMENT
