: 2684x2334 px
: June 25, 2018
Of course, in modern cars, there are battery charge indicators (in the same panel as the speedometer, fuel gauge and temperature gauge). Using these indicators, you can be able to know when your battery is developing problems, like when it is losing charge too quick, even without opening your car's bonnet. Naturally, these indicators only work for as long as the battery is at least 'basically functioning;' for it is the very same battery that powers them.
If the battery terminals are clean and tight, then the next item to check is drive belt tension. If the belt which drives the alternator is too loose, then the alternator will not produce enough electrical current to keep up with demand. Many modern vehicles utilize a single belt which drives the alternator and other accessories. This system usually also has an automatic belt tensioner which always maintains correct tension and is not adjustable. If your vehicle uses a wide, multigrooved or so-called "Serpentine" belt to drive the alternator, then it likely also has an automatic tensioning device.