Isuzu engine 4j series. Manual - part 81

6D1 – 2  ENGINE ELECTRICAL

GENERAL DESCRIPTION

There are six battery fluid caps at the top of the battery.
these are covered by a paper label.

The battery is completely sealed except for the six
small vent holes at the side.  these vent holes permit
the escape of small amounts of gas generated by the
battery.

This type of battery has the following advantages over
conventional batteries.

1.

There is no need to add water during the entire
service life of the battery.

2.

The battery protects itself against overcharging.
The battery will refuse to accept an excessive
charge.

(A conventional battery will accept an excessive
charge, resulting in gassing and loss of battery
fluid.)

3.

The battery is much less vulnerable to self
discharge than a conventional type battery.

DIAGNOSIS

1. VISUAL INSPECTION

Inspect the battery for obvious physical damage, such as a
cracked or broken case, which would permit electrolyte
loss.

Replace the battery if obvious physical damage is
discovered during inspection.

Check for any other physical damage and correct it as
necessary.  If not, proceed to Step 2.

2. FLUID LEVEL CHECK

The fluid level should be between the upper level line and
lower level line on side of the battery.

a. CORRECT FLUID LEVEL - Charge the battery.

b.  BELOW LOWER LEVEL - Replace battery.

3. VOLTAGE CHECK

(1) Put voltmeter test leads to battery terminals.

a. VOLTAGE IS 12.4V OR ABOVE – Battery

condition OK.

b. VOLTAGE IS UNDER 12.4V - Go to procedure (2)

below.

(2) Determine fast charge amperage from specification

(See Main Data and Specifications in this section).

Fast charge battery for 30 minutes at amperage rate
no higher than specified value.

Take voltage and amperage readings after charge.

a. VOLTAGE IS ABOVE 16V AT BELOW 1/3 OF

AMPERAGE RATE - Replace battery.

b. VOLTMETER IS ABOVE 16V AT ABOVE 1/3 OF

AMPERAGE RATE - Drop charging voltage to 15V
and charge for 10 - 15 hours.

c.

VOLTAGE IS BETWEEN 12V AND 16V -
Continue charging at the same rate for an
additional 3-3.5 hours.

d. VOLTAGE IS BELOW 12V - Replace battery.

6D1-2-1.tif

ENGINE ELECTRICAL  6D1 – 3

4. LOAD TEST

(1) Connect a voltmeter and a battery load tester across

the battery terminals.

(2) Apply 300 ampere load for 15 seconds to remove

surface charge from the battery.

Remove load.

(3) Wait 15 seconds to let battery recover.  Then apply

specified load from specifications (See Main Data and
Specifications in this section).

Read voltage after 15 seconds, then remove load.

a. VOLTAGE DOES NOT DROP BELOW THE

MINIMUM LISTED IN FOLLOWING TABLE - The
battery is good and should be returned to service.

b.  VOLTAGE IS LESS THAN MINIMUM LISTED -

Replace battery.

ESTIMATED TEMPERATURE

°F

°C

MINIMUM VOLTAGE

70

21

9.6

60

16

9.5

50

10

9.4

40

4

9.3

30

-1

9.1

20

-7

8.9

10

-12

8.7

0

-18

8.5

The battery temperature must be estimated by feel and by the
temperature the battery has been exposed to for the
preceding few hours.

6D1 – 4  ENGINE ELECTRICAL

ON-VEHICLE SERVICE

BATTERY CHARGING

Observe the following safety precautions when charging
the battery:

1. Never attempt to charge the battery when the fluid

level is below the lower level line on the side of the
battery.  In this case, the battery must be replaced.

2. Pay close attention to the battery during the charging

procedure.

Battery charging should be discontinued or the rate of
charge reduced if the battery feels hot to the touch.

Battery charging should be discontinued or the rate of
charge reduced if the battery begins to gas or spew
electrolyte from the vent holes.

3. In order to more easily view the hydrometer blue dot or

ring, it may be necessary to jiggle or tilt the battery.

4. Battery temperature can have a great effect on battery

charging capacity.

5. The sealed battery used on this vehicle may be either

quick-charged or slow-charged in the same manner as
other batteries.

Whichever method you decide to use, be sure that you
completely charge the battery.  Never partially charge
the battery.

ENGINE ELECTRICAL  6D1 – 5

JUMP STARTING

JUMP STARTING WITH AN AUXILIARY
(BOOSTER) BATTERY

CAUTION:

Never push or tow the vehicle in an attempt to start it.
Serious damage to the emission system as well as
other vehicle parts will result.

Treat both the discharged battery and the booster
battery with great care when using jumper cables.
Carefully follow the jump starting procedure, being
careful at all times to avoid sparking.

WARNING:

Failure to carefully follow the jump starting procedure
could result in the following:

1. Serious personal injury, particularly to your eyes.

2. Property damage from a battery explosion, battery

acid, or an electrical fire.

3. Damage to the electronic components of one or

both vehicles particularly.

Never expose the battery to an open flame or
electrical spark.  Gas generated by the battery may
catch fire or explode.

Remove any rings, watches, or other jewelry before
working around the battery.  Protect your eyes by
wearing an approved set of goggles.

Never allow battery fluid to come in contact with your
eyes or skin.

Never allow battery fluid to come in contact with
fabrics or painted surfaces.

Battery fluid is a highly corrosive acid.

Should battery fluid come in contact with your eyes,
skin, fabric, or a painted surface, immediately and
thoroughly rinse the affected area with clean tap
water.

Never allow metal tools or jumper cables to come in
contact with the positive battery terminal, or any other
metal surface of the vehicle.  This will protect against
a short circuit.

Always keep batteries out of the reach of young
children.