GMC 1976 ZEO 6083 Maintenance Manual page 381

CAUTION : Never expose battery to open
flame or electric spark-battery action gen-
erateshydrogen gas which is flammable and
explosive. Don't allow battery fluid to con-
tact skin, eyes, fabrics, orpainted surfaces-
fluid is a sulfuric acid solution which could
cause serious personal injury or property
damage. Wear eye protection when working
with battery.
CAUTION : Remove rings, metal watchbands
and other metal jewelry before jump start-
ing -or working around a battery, and be
careful In using metal toolsif such metal
should contact the positive battery terminal
(or metal in contact with it) and any other
metal on the vehicle a short circuit may
occur which could cause personal injury.
Each vehicle is equipped with two batteries; the
main (automotive) battery and an auxiliary battery.
The GMC Dual Battery System provides power
from two batteries to the vehicle 12-volt electrical
system either in combination or singularly . The com-
ponents used to provide charging and/or switching
are conventional, except for a diode assembly_ with_
which both batteries will receive chargmg_ . currgnt
whenever the vehi cle is running. The diode assembly
SECTION 6Y
ENGINE ELECTRICAL
Contents of this section are listed below:
BATTERIES
ENGINE ELECTRICAL 6Y- 1
SUBJECT PAGE NO .
Batteries .. . . . .. . . .... . ... . . . .. . . ... . .... . . . . . . . ... . .... . ... . . . .. . . .. . . .. . . . .. . . .. . . . .. . . . ... . . .. . . . .. . . .... . . .. . . . ... . .... . ... . . . .. . . . 6Y-1
Battery Specifications . . . ... . . ... . . ... . . ... . . ... . . ... . ... . .... . ... . ... . .... . . .. . . . .. . . .... . ... . . . ... . .... . ... . . . .. . . .... . ... . . 6Y-16
Generating System .. . . ... . . ... . . ... . . ... . . ... . . ... . . .. . . ... . ... . . .. . . ... . .... . ... . . . .. . . .... . ... . . . .. . . .... . . .. . . . .. . . .... . ... . . 6Y-17
Generator Specifications ... . .... . . .. . . . ... . .... . ... . . ... . ... . ... . . ... . . .. . . . . . . . .... . . .. . . . ... . .. . . . ... . . . ... . .... . ... . . .. . . 6Y-29
Breaker Point Ignition System .. . . . .. . . .... . ... . .... .... . ... . .... . . .. . . .. . . . ... . . ... . . . .. . . .... . ... . . . .. . . ... . .... . ... . . 6Y-29
Breaker Point Ignition System Specifications .. . ... . . ... . . .. . . . ... . .... . . .. . . . ... . .... . . .. . . . ... . .... . ... . . .. . . 6Y-45
High Energy Ignition System . . .. . . . . . . . ... . . ... . .... .... . ... . .... . ... . . .. . . . ... . .... . . .. . . . ... . .... . . .. . . . .. . . .... . .. . . . 6Y-46
High Energy Ignition System Specifications . ... . ... . . ... . . .. . . . .. . . .... . . .. . . . ... . .... . . .. . . . ... . .... . ... . . .. . . 6Y-59
Starting System . . . ... . . ... . . ... . . ... . . ... . . ... . . .. . . . .. . . ... . ... . . .. . . ... . .... . ... . . . .. . . .... . . .. . . . .. . . .... . ... . . . .. . . .... . ... . . 6Y-60
Starter Specifications . . .. . . ... . .... . . . . . . . .. . . . ... . ... . . . . . . ... . ... . . ... . . .. . . . .. . . .... . . .. . . . ... . .... . . ... . . ... . .... . ... . . .. . . 6Y-68
has separate outputs to the two batteries and pro-
vides isolation between the batteries and their as-
sociated circuits whenever the engine is not running.
e MotorHome-The main (automotive) battery
(figure 1) is located behind the right front access
door . The auxiliary (living area) battery is located in
the storage or motor generator compartment.
o TransMode-The main (automotive) battery
and the auxiliary battery are both located behind the
right front access door . The- main (automotive) bat
tery sits in front of the auxiliary battery, Figure 2.
Vehicles equipped with the optional motor generator
include a cranking battery located in the motor gen-
erator or storage compartment, Figure 3.
In addition, two types of batteries are used; bat-
teries with vent cap flame arrestor feature shown in
Figure 4, or maintenance-free batteries shown in Fig-
ure 5.
Early model vehicles are entirely equipped with
flame arrestor type filler/vent cap batteries. Later
model MotorHomes have a maintenance-free main