GMC 4000 Series Service Manual page 400

This section, covering "ON-VEHICLE MAINTENANCE AND RE­
PLACEMENT" of charging system components, is divided into sections
shown in the Index following:
Subject
Battery
Starting System
Ignition System
Alternating Current Generating System
Model Application
G en eral D esc rip tio n
On-Vehicle Maintenance, T ests, and A d ju stm e n ts..............
Generator R ep la cem en t................................................................
Two-Unit Type R e g u la to r .............................................................
Full-Transistor Type Regulator
Trouble Analysis C h a r t ................................................................
The battery has three major functions to p er­
form on the vehicle:
1. It provides a source of current for starting
the engine.
2. It acts as a stabilizer to the voltage in the
electrical system .
STANDARD
Series E S -5 5 0 0 V ........................................................................................................
Series LA/LV-4000; EM-4500M/V; ES-4500V; PS-4500P
S eries EM-5500A/M/V; EM-6500A/V
Series SM-5500M/Y; SS-5500M; SM-6500M/Y
Series DLA/DLV-4000; EG-5500A/V; SG-5500M/Y; EG-6500A/V . . . .
OPTIONAL
Series ES-4500V; EM-5500A/V; E M -6 5 0 0 A /V ...............................................
Series EM-4500V; 5500V; 6500V ...........................................................................
Series LA/LV-4000; PS-4500P
Series DLA/DLV-4000; EG-5500A/V; SG-5500M/Y;SM-5500M/Y;
SS-5500M; EG-6500A/V; SM-6500M/Y
Series SM-5500M/Y; 6500M/Y; SS-5500M (Two Batteries in Series) . . .
BATTERY MAINTENANCE
FILLING BATTERY
Batteries are equipped with "Visual Level"
cell covers to facilitate checking electrolyte level
and lessen the possibility of overfilling the battery.
The cell covers are molded with a long, circular,
tapered vent well with two small vertical slots
G M C S E R V I C E M A N U A L
SECTION 6Y
Qncjine £lect>iical
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BATTERY MODEL APPLICATION CHART
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Page No.
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3. It can, for a limited time, furnish current
when the electrical demands of the electrical equip­
ment exceed the output of the generator.
Standard and optional type storage batteries
used on vehicles covered by this manual are shown
in the "Battery Model Application Chart" following:
.........................
...............................................
...............................................
diametrically opposite. Viewed from above with the
vent plugs removed, the lower end of the vent well
appears as a ring with small portions of the cir­
cumference missing. As water is added to the cell,
the surface of the rising liquid contacts the slotted
lower end of the vent well, causing a distortion of
the reflecting surface of the liquid which is very
noticeable. Thus, the lower end of the vent well
Sec. 6Y
Page 389
389
396
401
411
411
411
414
419
421
422
428
PART NO.
1980030
1980034
1980034
1980038
1980758
1980030
1980036
1980038
1980760
1980716