: 3000x2253 px
: June 25, 2018
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.
When you pop the hood and look at the complicated mechanical devices called engines, you notice right away there's plenty of wiring. In fact, the wires seem to snake around the engine in a complex configuration that makes little sense to anyone who is not a mechanic. Auto engines have plenty of electrical configurations that are critical to their smooth operation. The fact is that when a car experiences problems, it could easily be an electrical problem as much as it could be a mechanical problem. Any qualified mechanic needs to be familiar with both mechanical and electrical problems in order to be efficient at his or her job. That means a mobile car mechanic must be prepared to complete a variety of repairs including those related to the electrical systems.