Engine Electrical (3.2L): Diagnosis: Notes

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.

There is a built-in hydrometer (Charge test indicator (1)) at the top of the battery. It is designed to be used during diagnostic procedures.

Before trying to read the hydrometer, carefully clean the upper battery surface.

If your work area is poorly lit, additional light may be necessary to read the hydrometer.

1. BLUE RING OR DOT VISIBLE (5) - Go to Step  4 .
2. BLUE RING OR DOT NOT VISIBLE (4) - Go to next step.

Fig 1: Identifying Battery

Courtesy of ISUZU MOTOR CO.

The fluid level should be between the upper level line (2) and lower level line (3) on side of battery.

1. CORRECT FLUID LEVEL - Charge the battery.
2. BELOW LOWER LEVEL - Replace battery.

Fig 2: Identifying Fluid Level

Courtesy of ISUZU MOTOR CO.

1. Put voltmeter test leads to battery terminals.

1. VOLTAGE IS 12.4V OR ABOVE - Go to Step 5.
2. VOLTAGE IS UNDER 12.4V - Go to procedure (2) below.

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

Take voltage and amperage readings after charge.

1. VOLTAGE IS ABOVE 16V AT BELOW 1/3 OF AMPERAGE RATE - Replace battery.
2. VOLTAGE IS ABOVE 16V AT ABOVE 1/3 OF AMPERAGE RATE - Drop charging voltage to 15V and charge for 10 - 15 hours. Then go to Step 5.
3. VOLTAGE IS BETWEEN 12V AND 16V - Continue charging at the same rate for an additional 3-1/2 hours. Then go to Step 5.
4. VOLTAGE BELOW 12V - Replace Battery.

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 (Refer to MAIN DATA AND SPECIFICATIONS  ).

   Read voltage after 15 seconds, then remove load.

   1. VOLTAGE DOES NOT DROP BELOW THE MINIMUM LISTED IN THE TABLE - The battery is good and should be returned to service.
   2. VOLTAGE IS LESS THAN MINIMUM LISTED - Replace battery.
   Fig 3: Temperature & Voltage Chart

   Courtesy of ISUZU MOTOR CO.