Automotive electrical systems have grown more complex over the years, but the basic principles behind them are similar. The alternator or generator will power the car while recharging the battery at the same time. A common problem with some systems is the tendency to “strobe,” or make the lights flicker. Diagnosing the problem could take the backyard mechanic a few minutes, fixing it could take up to an hour.
Fixing flickering lights in an automobile
Check the alternator/generator with a voltmeter. The most common reason for flickering lights is a worn out alternator, as one of the three rotating plates that generate electricity wears out.