Chevrolet 10 Series 1968, Service Manual, Page: 426 / 713

SECTION 6Y
ENGINE ELECTRICAL
CONTENTS OF THIS SECTION
Page
B a t t e r y ....................................................................................6Y-1 Starting S y s te m .......................................................................6Y-35
Charging S y s t e m ....................................................................6Y-7 Special T o o l s .......................................................................... 6Y-38
Ignition S y s t e m .......................................................................6Y-19
BATTERY
INDEX
Page
General D e s c r ip t io n ............................................................. ... 6Y-1
Dry Charged B a tte r ie s .......................................................... 6Y-2
Activating Dry Charged B a tte r ie s ................................... ... 6Y-2
Wet Charged B a tte r ie s .......................................................... 6Y-3
P e rio d ic S e r v i c e ....................................................................... 6Y-3
Common Causes of F a i l u r e ............................................. ... 6Y-3
E lectrolyte L e v el
............................................................. ... 6Y-3
Water U s a g e .......................................................................... 6Y-4
Cleaning ............................................................................. ... 6Y-4
C a b les ....................................................................................... 6Y-4
C a rrie r and H o ld - d o w n ................................................... ... 6Y-4
Safety P r e c a u t io n s ............................................................. ... 6Y-4
Page
Charging P r o c e d u r e s ............................................................. ... 6Y-4
Slow C h a r g in g ................................................................... ... 6Y-4
Fast C h a r g in g .......................................................... r . . 6Y-4
Emergency Boost C h a r g in g ............................................. ... 6Y-4
T est P r o c e d u r e s ................................................................... ... 6Y-5
Visual Inspection ............................................................. ... 6Y-5
In s t r u m e n t .......................................................................... ... 6Y-5
Full Charge Hydrom eter T e s t ............................................. 6Y-5
Specific Gravity R e a d in g s ................................................ ... 6Y-5
C ell Comparison T e s t ................................................... ... 6Y-7
Installing B a tte r y ................................................................... ... 6Y-7
GENERAL DESCRIPTION
The Battery (fig. lb) is made up of a number of sepa­
rate elements, each located in an individual cell in a
hard rubber case. Each element consists of an assembly
of positive plates and negative plates containing dis­
similar active materials and kept apart by separators.
The elements are immersed in an electrolyte composed
of dilute sulfuric acid. Plate straps located on the top
of each element connect all the positive plates and all
the negative plates into groups. The elements are con­
nected in series electrically by connectors that pass
directly through the case partitions between cells. The
battery top is a one-piece cover of hard rubber con­
struction. The cell connectors, by-passing through the
cell partitions, connect the elements along the shortest
practical path (fig. 2b). With the length of the electrical
circuit inside the Battery reduced to a minimum, the
internal voltage drop is decreased resulting in improved
performance, particularly during engine cranking at low
temperatures.
The hard, smooth one-piece cover greatly reduces the
tendency for corrosion to form on the top of the Battery.
The cover is bonded to the case with sealing compound
that forms an air tight seal between the cover and case.
Protection for the Battery charging circuit (10 gauge
wire) is provided by a pigtail lead which is a fusible
link off the battery positive cable (14 gauge wire). This
lead is an integral part of the Battex'y cable assembly
and servicing requires replacing the complete cable
assembly.
A battery generally has two classifications of ratings:
(1) a 20 hour rating at 80 F and, (2) a cold rating at O F
CHEVROLET TRUCK SERVICE MANUAL