Chevrolet 10 Series 1970, Service Manual

Page: 397 / 671

ENGINE-ELECTRICAL 6Y-5
When the battery is in the ve h ic le , the studs provided
in the w irin g harness a re suitable fo r attachment o f the
c h a rg e r’ s leads.
When out o f the veh icle, the sealed side term in al
battery w ill req u ire adapters fo r the term in a ls to p rovid e
a place fo r attachment o f the charging leads. Adapters
a re availab le through local parts s e rv ic e .
When the sealed term in al battery is in the v e h ic le , the
studs provided in the w irin g harness a re suitable fo r
attachment o f the c h a rg e r's leads.
CAUTIO N: E x e rc is e care when attaching ch a r­
g e r leads to side term in al studs to avoid contact
with veh icle m etal components which would r e ­
sult in damage to the battery.
CHARGING GUIDE
Recom m ended R ate* and T im e fo r F ully D ischarged Condition
W att Rating 5 A m p eres
10 A m p eres 20 A m p eres 30 A m p eres 40 A m p eres
50 A m p eres
B elow 2450 10 Hours 5 Hours
2-1/2 Hours 2 Hours
2450-2950 12 Hours 6 Hours 3 Hours
2 Hours
1-1/2 Hours
A bove 2950 15 Hours
7-1/2 Hours 3-1/4 Hours 2 Hours
1-3/4 Hours 1-1/2 Hours
^In itial rate fo r constant voltage taper rate charger.
T o avoid damage, charging rate must be reduced or tem p o ra rily halted if:
1. E le c tro ly te tem peratu re exceeds 125°F.
2. V iolen t gassing or spewing of e le c tro ly te occurs.
B attery is fu lly charged when over a two hour period at a low charging rate in am peres a ll c e lls a re gassing
fr e e ly and no change in sp e c ific g ra v ity occurs.
F o r the most sa tisfa cto ry charging, the low er charging ra tes in
am peres are recom m ended.
F u ll charge sp ecific g ra v ity is 1.260-1.280 c o rre c te d fo r tem perature with e le c tro ly te le v e l at split ring.
BATTERY TESTING PROCEDURES
T e s tin g proced u res a re used to determ ine whether
the B attery is (1) good and usable, (2) re q u ire s r e ­
charging o r (3) should be rep laced . A n alysis o f B attery
conditions can be accom plished by p erfo rm in g a visual
inspection. Instrument T e s t and the full charge hydro-
1. VISUAL INSPECTION
The fir s t step in testing the B attery should be a visual
inspection, which v e r y often w ill save tim e and expense
in determ ining B attery condition.
• Check the outside o f the B attery fo r a broken or
cracked case o r a broken o r cracked co v e r. If
any damage is evident, the B attery should be
replaced.
• Note the e le c tro ly te le v e l. L e v e ls that a re too
low o r too high may cause poor p erform an ce,
as covered in the s e c t i o n entitled " P e r io d ic
S e r v ic in g ".
• Check fo r loose cable connections, and fo r e v i­
dence o f co rro sio n as co vered in section entitled
“ P e r io d ic S e rv ic in g ” . C o rre c t as requ ired b efo re
p roceed in g with tests.
2. INSTRUMENT TEST
A number o f suppliers have approved testing equipment
a va ila b le. T h ese te s te rs have a p rogram m ed test p ro c e ­
dure consisting o f a s e r ie s o f tim ed discharge and charge
events, requ irin g approxim ately 2 to 3 minutes, that
w ill determ ine the condition o f the B attery with a high
d e g re e o f accuracy. When using these te s te rs , the p ro ­
cedure recom m ended by the te s te r m anufacturer should
be follow ed. B a tteries should not be charged p r io r to
testin g o r doing so may a lte r the test resu lts. If a
te s te r is not a va ilab le fo r testing, the “ S p ecific G ra vity
C e ll Com parison T e s t” may be used o r an alternate
method, but with a s a c r ific e in testing accu racy.
NOTE: New e n e r g iz e r s which have becom e
com p letely discharged o v e r a r e la tiv e ly long
p eriod o f tim e, such as during veh icle storage,
should be tested by the hydrom eter method.
E n e rg iz e rs discharged to this degree cannot be
accu rately tested using equipment requ irin g load
capability com parison tests.
3. FULL CHARGE HYDROMETER TEST
T h is test should be used only on B a tte rie s which test
good with testing equipment o r “ S p ecific G ravity C ell
Com parison T e s t ” but which subsequently fa il in s e r v ic e .
• R em ove the B attery fro m the ve h ic le , and adjust
the e le c tro ly te le v e l as n ecessary, by adding c o lo r ­
le s s , od o rless, drinking w ater.
• Fully charge the B attery at the Slow Charging
rate as covered on the section entitled “ B attery
Charging” .
• M easure the sp e c ific g ra vity o f the e le c tro ly te in
each c e ll and in terp ret as follow s:
H ydrom eter Reading L e s s Than 1.230--Fu ll
charge h ydrom eter readings le s s than 1.230 c o r ­
rected fo r tem peratu re indicate the B attery is
d efective and should be replaced.
H ydrom eter Readings A bove 1.310--F u ll charge
hydrom eter readings above 1.310 c o rre c te d fo r
tem peratu re indicate that the c e lls have been im ­
CHEVROLET TRUCK SERVICE MANUAl