Cummins 4BT – Battery Checking

Fill each battery cell with distilled water. Refer to the manufacturer s specifications.
NOTE: Maintenance-free batteries are sealed and do not require the addition of water.

If conventional batteries are used (now maintenance free), check the specific gravity of the battery electrolyte in each
cell.

All batteries, including maintenance free, can be checked by measuring the voltage between the positive battery
cable and the engine block (ground). Note the voltage.

Using a remote start connection, attempt to engage the starter while observing the voltage.
If the voltage reads less than 10 volts DC, charge the battery.
If the voltage drops rapidly more than 2 volts DC, replace the battery.