Many alternator problems turn out to be nothing more than a bad connection at the alternator or a bad wiring harness.
If only battery voltage is present at the battery on a running engine, does this mean the alternator is “bad?” No, it does not. It only means that the alternator is not charging, but does not reveal why. Therefore, it does not point to a faulty alternator. All too often, the alternator is condemned by technicians due to this test alone. The cause could instead be a module that distributes the power to the vehicle and regulates the alternator.
Engineers have devised two strategies that can be called the “immune system” for the electrical system.
The measurement of voltage is like the speed of the traffic.
Understanding why spark plugs get dirty.
The problem may not have been caused by a complicated reason, something simple may have caused the system not to work.
Faulty battery cables, if loose, corroded, or damaged, can lead to power drainage.
Power windows are great as long as they roll up and down when commanded to do so.
There are opportunities your shop can’t pass up just because the car or SUV has a hybrid badge on the back.
Ignition coil and plug diagnostics.