How do I know if my alternator is not working?

Related questions

1. Why is my alternator not charging my battery?
2. What can I do if my iPhone won't charge?
3. Why has my iPhone just gone dead?
4. How do I know if my dead iPhone is charging?
5. Does leaving a laptop plugged in ruin the battery?
6. Can iPhone 6s battery be replaced?
7. Why isnt my laptop charging when plugged in?
8. How do I force my iPhone to turn on?
9. Does my iPhone qualify for a new battery?
10. Is it my battery or alternator?

Tags

1. #stalls
2. #vehicle
3. #continues
4. #problem
5. #unfortunately
6. #likely
7. #engine
8. #alternator
9. #negative
10. #battery
11. #there
12. #running
13. #cable
14. #certain
15. #tested
16. #while
17. #remove