How do I know if my alternator is bad

Tiny
GORDIN
  • MEMBER
  • 1995 MAZDA MPV
  • 12,000 MILES
Changed the battery for a new one also changed the starter and gave it a tune up
Sunday, February 26th, 2012 AT 7:36 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
Why do you suspect it's bad? What's the symptom?

To test the system you need a load tester but you can start by measuring battery voltage with an inexpensive digital voltmeter while the engine is running. It must be between 13.75 and 14.75 volts.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Sunday, February 26th, 2012 AT 9:15 PM

Please login or register to post a reply.

Related Alternator Not Charging Content

Alternator Replacement
VIDEO
Alternator Replacement
Instructional repair video
Alternator Replacement
GUIDE
Alternator Replacement
Got a red battery warning light on? This most likely means the alternator has gone out and needs a replacement. To confirm the failure use a voltmeter to test the alternator...
VIEW MORE

Sponsored links