53
BATTERY TROUBLESHOOTING
Condition of Battery Cause Countermeasures Cause
Starter does not function - Key is not "ON".
- Battery is over-used until 
light becomes dim.
- Defective alternator or 
rectifier preventing 
charging of the battery.
- Dirty or corroded terminal 
contacts.
- Bad brushes, armature or 
field in alternator.
- Life of battery expired.
-Turn key "ON"
- Charge for a long period 
at the normal charging 
rate until specific gravity 
of 1.26 is reached.
- Repair alternator and 
replace defective rectifier, 
and fully charge the 
battery.
- Wash terminal with hot 
water and tighten well.
- Replace.
- Replace battery.
- Do not overuse the 
battery and charge before 
being fully discharged.
- Check alternator/rectifier.
- Keep terminals clean and 
well tightened. Coat 
terminals with grease to 
prevent corrosion.
Low electrolyte level - Battery used with 
shortage of electrolyte.
- Battery over-used. 
Charging was neglected. 
(Refrain from over- 
discharging)
- Defective alternator/
rectifier, defective 
terminal contacts causing 
corrosion of electrodes.
- Add distilled water and 
charge battery.
- Charge for a long period 
at the normal charging 
rate.
- Check alternator and 
rectifier, and charge for a 
long period at the normal 
charging rate.
- Make routine checks of 
electrolyte.
- Do not overuse the 
battery and charge before 
being fully discharged.
- Make routine checks of 
terminals to make sure 
they are clean and tight
Battery cannot be charged - The current of the 
alternator during 
operation is too high, 
causing plates to drop, 
warp, or short circuit.
- Lift of battery expired
- Decrease the charging 
current of alternator.
- Replaced damaged 
battery.
- Exchange battery.
- Check charging current at 
alternator.
Corrosion of terminals is 
severe
- Current of the alternator 
during operation is too 
high.
- Clean corrosion from 
terminals and tighten well. 
- Adjust charging current of 
alternator.
- Keep terminals clean and 
well tightened.
- Apply a coat of grease to 
terminals to prevent 
corrosion.
- Check charging current of 
alternator.
Electrolyte decreases 
rapidly
- Over heating due to over 
charging.
- Battery cracked or has 
small holes.
- Check charging output.
- Replace battery.
- Secure battery in tractor 
so it cannot move.