In a lead-acid battery, each cell typically has a nominal voltage of about 2 volts. If one cell is shorted, it effectively contributes 0 volts instead of 2 volts. Therefore, if the battery has multiple cells, the total voltage will be reduced by the voltage of the shorted cell; for example, in a 12-volt battery with 6 cells, the voltage would drop to around 10 volts.
it would get a lot of voltage
Forgot to connect ground cable? Shorted Fusable link battery + cable not connected
It could blow up the battery.
Shorted diodes in the alternator.
Test the voltage of the battery. if the voltage is below the rating of a new battery (For a CR203 it would be 3.6 volts) it is defective.
Could be a shorted wire, or bad battery.
Something is shorted to ground.
You need to do a parasitic draw test. Use a voltmeter to check base voltage of battery. Then crank the engine, check voltage at battery. It needs to be at least two more volts than previous base voltage. Then apply a load or turn on headlights. The voltage should not drop over one volt. Ideal base voltage at battery terminals is 12.6, ideal charging voltage would be 14.6, ideal loaded voltage would be 13.6 volts aproximately. If you find a drainage in system and you have a good battery, then you need to check radio and main accessories first, then check door latch switches and courtesy dome lamps. You need to do a parasitic draw test. Use a voltmeter to check base voltage of battery. Then crank the engine, check voltage at battery. It needs to be at least two more volts than previous base voltage. Then apply a load or turn on headlights. The voltage should not drop over one volt. Ideal base voltage at battery terminals is 12.6, ideal charging voltage would be 14.6, ideal loaded voltage would be 13.6 volts aproximately. If you find a drainage in system and you have a good battery, then you need to check radio and main accessories first, then check door latch switches and courtesy dome lamps.
Transformer short circuit tests are used to determine the impedances (positive and zero sequence) of the transformer. A simple explanation: to do this one winding is shorted, and voltage is applied to another winding to circulate the normal full load current of the transformer. The impedance of the transformer is the applied voltage divided by the induced current. If one winding was not shorted, the voltage divided by induced current would not give the impedance of the transformer - the induced current would be much lower, giving a much higher impedance measurement that would be essentially meaningless.
The battery would likely not fit in the holder. Although it would provide the correct voltage, it would not last as long as the proper battery would.
Chances are the alternator is defective. a shorted armature, or shorted or burnt out field. Check battery voltage, if suddenly is discharged, this should confirm the a defective alternator or broken alternator belt. Also check for blown fuse or melted fusible link or tripped circuit breaker in starting and charging system.
happened on mine when the battery shorted out against the bonnet