6H-2 CHARGING SYSTEM
GENERAL DESCRIPTION
BATTERY
The battery has three major functions in the electrical system.
It is a source of electrical energy for cranking the engine.
It acts as a voltage stabilizer for the electrical system.
It can, for a limited time, provide energy when the electrical load exceeds the output of the generator.
CARRIER AND HOLD-DOWN
The battery carrier should be in good condition so that it will support the battery securely and keep it level.
Before installing the battery, the battery carrier and hold-down clamp should be clean and free from corrosion
and make certain there are no parts in carrier.
To prevent the battery from shaking in its carrier, the hold-down bolts should be tight enough but not over-tight-
ened.
ELECTROLYTE FREEZING
The freezing point of electrolyte depends on its specific gravity. Since freezing may ruin a battery, it should be
protected against freezing by keeping it in a fully charged condition. If a battery is frozen accidentally, it should
not be charged until it is warmed.
SULFATION
If the battery is allowed to stand for a long period in discharged condition, the lead sulfate becomes converted
into a hard, crystalline substance, which will not easily turn back to the active material again during the subse-
quent recharging. “Sulfation” means the result as well as the process of that reaction. Such a battery can be
revived by very slow charging and may be restored to usable condition but its capacity is lower than before.
BUILT-IN INDICATOR (IF EQUIPPED)
The battery has a built-in temperature compensated indicator in the top of the battery. This indicator is to be
used with the following diagnostic procedure. When checking the indicator, make sure that the battery has a
clean top. A light may be needed in some poorly-lit areas.
Three types of indication available under normal operation are as
follows.
Green Dot
Battery is sufficiently charged for testing.
Dark
Battery must be charged before testing.
If there is a cranking complaint, battery should be tested as
described in Diagnosis section. Charging and electrical sys-
tems should also be checked at this time.
Clear or Light Yellow
This means that fluid level is below the bottom of hydrome-
ter. Its possible cause is excessive or prolonged charging, a
broken case, excessive tipping or normal battery deteriora-
tion. When the battery is found in such condition, it is possi-
ble that high charging voltage is caused by the faulty
charging system and therefore, charging and electrical sys-
tems need to be checked. If there is a trouble in cranking
and its cause lies in the battery, it should be replaced.
6H-14 CHARGING SYSTEM
SPECIFICATION
BATTERY
GENERATOR
TIGHTENING TORQUE SPECIFICATION
NOTE:
The battery used in each vehicle is one of the following two types, depending on specification.
Battery type 38B20L 55B24L
Rated capacity AH/5HR, 12 Volts 28 38
Electrolyte L (US/Imp. pt) 2.1 (4.44/3.70) 2.8 (5.92/4.93)
Electrolyte S.G. 1.28 when fully charged at 20°C (68°F)
Type 75 A type
Rated voltage 12 V
Nominal output 75 A
Permissible max. speed 18000 r/min.
No-load speed 1020 r/min (rpm)
Setting voltage 14.2 to 14.8 V
Exposed brush length Standard: 10.5 mm (0.41 in.)
Limit: 1.5 mm (0.06 in.)
Permissible ambient temperature–30 to 90°C (–22 to 194°F)
Polarity Negative ground
Rotation Clockwise viewed from pulley side
Fastening partTightening torque
Nm kg-m lb-ft
Body ground bolt 8 0.8 6.0
Generator bolts 23 2.3 16.5
“B” terminal inner nut 4.2 0.42 3.0
“B” terminal outer nut 8 0.8 6.0
Pulley nut 111 11.1 80.5
Rear end frame nuts 4.5 0.45 3.5
Rear end cover nuts 4.5 0.45 3.5
Rectifier “B” bolt 3.9 0.39 3.0
Stator stud bolts 8.8 0.88 6.5
Drive end bearing plate screws 2.6 0.26 2.0
Rectifier screws 2.0 0.20 1.5
Regulator and brush holder screws 2.0 0.20 1.5
Terminal plate bolt 3.8 0.38 3.0
