the only reliable way of determing if your alternator has gone bad is to have it tested by an automotive electricial specialist. That is because most modern alternators have the voltage regulator built in, so just testing to see if it is generating will not tell the whole story. Warning signs of alternator/voltage regulator failure are dead battery, but battery can be charged, lights dimming and getting brighter while driving, and hard starting.
bad bulbs
Bad heater core?
it is possible the wheel hub is damaged.
Maybe a bad alternator, or could need a tuneup.
Check coolant level? Bad thermostat? Heater core airbound? Temperature control cable not adjusted properly?
Your alternator might be bad and not charging your battery properly.
Alternator not charging battery due to a bad fusable link?
Turn car on remove positive battery terminal if car turns off alternator is bad
When your battery does not get charge.
On a 1999 GEO Tracker, a bad fuse can cause the headlights and dash lights to blink. A bad voltage regulator or alternator can also cause lights to blink and flicker.
Typically you know your alternator is out when you have to jump start your car numerous times. A way you can test it is by turning on your car and while it's running discount the + terminal. If the car turns off then your alternator is bad. If the car remains in then alternator is good and possible bad battery. Hope this helps
If it is makeing a noise or is not putting out at least 13.5 volts it is bad. Take the car or the alternator to an Auto Parts store and have them load test the alternator to be sure.