2005 F150 battery question
Yesterday while driving home from the office I
noticed that my battery light suddenly lit. Rev
engine it goes out; no other indication of failure;
that car starts fine runs fine; all gauges is working
properly.
Tonight driving home I noticed that the battery light
was lit the battery indicator kept dropping dropping
dropping . Near home all gauges failed; windows
will not close; lights will not turn on; all indication
internally of complete electrical failure .
With a diagnostic tool I determined that battery was
low and not charging
I check battery charge confirmed to be low
How can I determine if it's the alternator or just the
battery ?