The alternator may have a faulty rectifier or faulty voltage regulator
It is possibley your alternator or battery
You may see the headlights and dash lights flicker at an idle. You may hear unusual noises coming from the alternator when the engine is running.
If the engine is running and the alternator is good. If the engine is not running, no.
The alternator is run by a belt connected to the engine. When the engine is running the alternator is turning. The alternator is what produces the electrical current that charges the battery & powers everything electrical while the engine is running. the battery is mainly to start the engine.
Anytime the engine is running.
If the loose cable is the main one from the negative side of the battery, then everything will flicker simultaneously with the key on and the engine stopped. When the engine is running, the alternator will keep things energized. If you have a loose groung cable on one particular accessory, only that accessory will flicker or just remain off.
Check the alternator output, you may have a failed voltage regulator or bad brushes in the alternator resulting in an oscillating voltage value. This assumes that the flicker is relalted to engine rpms.
No , just when the engine is running
Check voltage with a voltmeter at the battery With engine running readings should be 13.8-14.2 With engine running hold a screw driver to the back of the alternator, if there is no magnetic field, the alternator is bad.
No. The alternator has to be turning to produce the charging voltage. It only turns when the engine is running.
If it is running on the battery only then that means the alternator is not charging the battery.
Get engine running. While the engine is running disconect the POSITIVE termninal from the battery. If the engine dies, the Alterntor is bad.