GMC 4000 Series Service Manual page 406

vehicle and place it on a charging line. Charge the
battery until the specific gravity reaches 1.260-
1.280.
Before a new truck is placed in service, make
sure the specific gravity of the battery electrolyte
is at least 1.250, preferably higher. Under no cir­
cumstances should acid be added to a new battery,
to increase the specific gravity of the electrolyte.
CARE OF NEW BATTERIES IN STORAGE
New batteries in storage should be. stored and
cared for in accordance with instructions furnished
by the battery manufacturer.
PREPARING DRY-CHARGED
BATTERIES FOR SERVICE
Electrolyte should be added to dry-charged
batteries in accordance with instructions furnished
by the battery manufacturer.
BATTERY CABLES
Excessive resistance caused by terminal con­
nections and partial short circuits through defec­
tive cable insulation will result in abnormal volt­
PART NO. MODEL NO.
1980030
E-5000; R-58
1980034
E-3000; Y-58
1980036
E-5000; R-68
1980038 E-3000; Y-70
1980716
4-HR-160
1980758 4-DR-150
1980760 8 DR-205
G M C S E R V I C E M A N U A L
age drop in starter cable. Low voltage at starter
will prevent normal starter operation and will
cause hard starting. The following tests must be
made with primary wire disconnected from dis­
tributor or coil to prevent engine starting:
battery terminal and vehicle frame. Place one prod
of test voltmeter on grounded battery post (not
on cable clamp) and the other on frame. Operate
starter and note the voltage reading.
battery terminal and starter terminal stud with
starter operating.
and frame with starter operating.
more than 0.5 volt on gasoline models or 1.0 volt
on D iesel models, there is excessive resistance
in the circuit. To eliminate resistance, the cables
should be disconnected and connections cleaned. If
cables are frayed or the clamps excessively cor­
roded the cables should be replaced. When selec t­
ing new cables, be sure they are at least as large
as the ones being replaced.
SPECIFICATIONS
BATTERY SPECIFICATIONS
TALOG
NO. VOLTS
12
12
12
12
716 6
758 12
12
760
1. Check voltage drop between grounded (-)
2. Check voltage drop between ungrounded (+)
3. Check voltage drop between starter housing
4. If voltage drop in any of the above tests is
NO. OF AMP. HR.
PLATES CAPACITY
PER AT HR.
20
CELL
RATE
11 61
9
53
11 70
11
70
21 160
19
150
27 205
Sec. 6Y
Page 395
BATTERY
CRANKING ABILITY
AT 0°F.
1.6 Min. ( > 300 Amps.
q
@
1.1 Min. 300 Amps.
2.1 Min. @ 300 Am ps.
(a,
2.0 Min. 300 Amps.
7.0 Min. (S 300 Amps.
6.0 Min. & 300 Am ps.
10.5 Min. (a, 300 Amps.