ENGINE
WG972-E4, WSM
1-S22
Battery Specific Gravity
1. Measure the specific gravity of the electrolyte in each cell with a
battery and coolant tester.
2. If the electrolyte temperature is different from the one that the
battery and coolant tester calibrated, correct the specific gravity
measurement. Use the formula below in (Reference).
3. If the specific gravity is less than 1.215 (after it is corrected for
temperature), charge or replace the battery.
4. If the specific gravity is different between 2 cells by more than
0.05, replace the battery.
(Reference)
• The specific gravity changes with temperature.
To be accurate, the specific gravity
decreases by 0.0007 when temperature increases by 1 °C
(decreases by 0.0004 when temperature increases by 1 °F),
increases by 0.0007 when temperature decreases by 1 °C
(increases by 0.0004 when temperature decreases by 1 °F).
Thus, if you refer to 20 °C (68 °F), correct the specific gravity
reading by the formula below:
– Specific gravity at 20 °C = Measured value + 0.0007 ×
(electrolyte temperature −20 °C)
– Specific gravity at 68 °F = Measured value + 0.0004 ×
(electrolyte temperature −68 °F)
At an electrolyte temperature of 20 °C (68 °F)
9Y1211108ENS0026US0
Motor Test
• Secure the starter to prevent it from jumping up and down
while testing the motor.
1. Disconnect the battery negative cable from the battery.
2. Disconnect the battery positive cable from the battery.
3. Disconnect the leads from the starter B terminal.
4. Remove the starter from the engine.
5. Connect a jumper lead from the starter C terminal (1) to the
battery positive terminal (2).
6. Connect a jumper lead momentarily between the starter's body
and the battery negative terminal (3).
7. If the motor does not operate, starter is failure.
Repair or replace the starter.
• B terminal: It is the terminal which connects the cable from
the battery to the starter.
• C terminal: It is the terminal which connects the cable from
the motor to the magnet switch.
9Y1211108ENS0027US0
Specific Gravity State of Charge
1.260 Sp. Gr. 100 % Charged
1.230 Sp. Gr. 75 % Charged
1.200 Sp. Gr. 50 % Charged
1.170 Sp. Gr. 25 % Charged
1.140 Sp. Gr. Very Little Useful Capacity
1.110 Sp. Gr. Discharged
(1) C Terminal
(2) Positive Terminal
(3) Negative Terminal
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