Checking the battery charge level (Fiesta 4)

If, despite the normal electrolyte level, the battery does not work properly, check its charge level. To do this, use a hydrometer (automotive densimeter). The scale of the device shows the density of the electrolyte in the battery. You can also use a precise universal measuring device (measurement accuracy ±0.02 V). The voltage at the terminals of an unloaded battery indicates the battery charge level.

Checking the density of the electrolyte

SEQUENCE OF WORKS

1. Perform the check only if the battery has been idle for at least 6 hours.

2. Unscrew (remove) the plugs from the battery jars.



Fig. 15.5. Using a hydrometer to check the density of electrolyte in a battery



3. Fill the hydrometer with enough electrolyte so that the measuring float floats freely in it (Fig. 15.5). Use the scale on the float to determine the density of the electrolyte and use it to determine the battery charge level. The battery charge level depending on the electrolyte density is given in Table 15.1. If the electrolyte density in all jars is equally low, the battery is considered sufficiently charged. If only one jar of the battery is discharged, the battery is faulty and must be checked in a workshop.

Measuring the voltage at the battery terminals

If the last charge was carried out within the last 6 hours, turn on the low beam for 30 seconds. This will smooth out possible voltage fluctuations.



Fig. 15.6. Using a multi-meter to measure the voltage at the battery terminals



After 4–5 minutes, measure the voltage at the battery terminals (Fig. 15.6). When measuring, switch off all electrical consumers. If the voltage is less than 12.3 V at the battery terminals with the load disconnected, the battery must be charged. The state of charge of the battery depending on the voltage at the terminals is given in Table 15.2.



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