GMC 1976 ZEO 6083 Maintenance Manual page 409

GENERATOR SPECIFICATIONS
(a)
Voltmeter not needed for cold output check. Load battery with a carbon
pile to obtain maximum output .
(b) Rated hot output at maximum operating speed.
BREAKER POINT IGNITION SYSTEM
IMPORTANT: Identify ignition system before ser-
vicing . 1975 vehicles with 1974 certified engines are
equipped with standard breaker point ignition sys-
tem. 1975 and 1976 certified engines are equipped
with high energy ignition systems. To determine year
engine was certified, refer to decal on engine valve
cover.
GENERAL DESCRIPTION
The ignition system used on the 1974 certified
engine is the standard breaker point type consisting
of a coil, condenser, distributor, switch, wiring,
spark plugs and a source of electrical energy . The
distributor contact points set, condenser, cam lu-
bricator and spark plugs are the only system compo-
nents that require periodic service. The remainder of
the ignition system requires only periodic inspection
to check the operation of the components, tightness
of electrical connections, and condition of the wiring .
The distributor used is an external adjustment
type and its function is to (1) cause a higher voltage
surge from coil, (2) time these surges with regard to
engine requirements through use of centrifugal and
ENGINE ELECTRICAL
6Y- 29
vacuum advance mechanisms, and (3) direct high
voltage surges through distributor rotor, cap, and
high tension wiring to the spark plugs.
The distributor houses the contact points that
make and break the primary circuit, and also directs
high voltage and current in proper sequence to the
spark plugs. The contact point set is replaced as a
complete assembly . The breaker lever spring tension
and point alignment on the replacement set are fac-
tory adjusted, leaving only the dwell angle to be
adjusted after installation .
The rotor located above the breaker plate assem-
bly serves as a cover for the centrifugal advance
mechanism, and distributes high voltage and current
to fire the spark plugs. When the rotor is removed,
the centrifugal advance mechanism should be in-
spected for lubricant. If necessary, a small amount of
cam and bearing lubricant should be applied to the
advance weights .
The ignition coil is an oil filled, hermetically
sealed unit designed specifically for use with an ex-
ternal resistance . The number of turns in the primary
winding results in a high inductance in this winding,
which makes it possible for the coil to provide a
Generator Model
(80 Amp.)
1101016
(80 Amp.)
1101015
Make .. . . .. ... . ... ... ... . ... .... ... . .. . . .. ... . ... . ... .... .... ... . ... .... .... ... ... .... ... .... ..
Delco-Remy Delco-Remy
Series . ... ... . ... .... .... ... ... ... . ... .... .... ... ... . . ... ... ..... ... ... . ... .... .... ... ... ... . .
27 SI 27 SI
Type .. ... ... . . . . ... . ... . ... ... ... .... .... ... . ... ... .... . ... .... .... ... ... . .... ... .... ... ... ... . .
100 100
Rotation (Viewing Drive End) . .... . ... .... .... ... .... .... ... . ... ... ... ... . .
Clockwise
Clockwise
Field Current at 80T. (26 .7°C .)
Amps . ... ... .... .... ... . ... ... ... .... .... ... . ... . ... . ... .... .... ... ... .... .... ... . ... ...
4.4-4 .9
4 .4-4 .9
Volts .. ... ... . ... . ... ... . ... ... ... .... .... ... . ... .... . ... ... . ... . ... ... .... ... . ... .... ...
12
12
Cold Output
Specified Volts . .... ... ... .... .. .. ... . ... .... . ... ... ..... ... ... .... ... . ... .... ...
(a)
(a)
Amps . ... ... .... .... ... . ... ... ... . ....... ... . .. .. ... . ... .... .... ... ... .... .... ... .... ...
76 76
Generator RPM (Approx.) .... ... ... . .... ... . ... .... . ... ... ........ ... ... . ... ...
5000 5000
Rated Hot Output (Amps.) (b) .. . .... ... . ... .... .... ... .... .... ... ... . ... ...
80 80