2002 Ford Focus battery light

Tiny
CATASHEVILLE
  • 2002 FORD FOCUS

Electrical problem
2002 Ford Focus 4 cyl Two Wheel Drive Automatic 60,000 miles

the battery light on the dash has recently been coming on while driving my 2002 ford focus wagon. As of today, the light does not turn off. I took the car in to the local mechanic who tested the battery with a voltmeter. The battery is just about one year old. The meter would jump from undercharging to overcharging and sometimes rest in the 'ok' area (sorry, I don't know the numbers). Without any further diagnostics I was told it was most certainly a faulty alternator = $300 or so. I am not looking for a cheaper solution, but a firm believer in "measure twice cut once" and want to be certain that all possible troubleshooting is performed before shelling out the bucks.

i have a couple of questions:

1. Can they test the alternator before replacing it to be certain it is the alternator that is causing the "jump" of the volts? And, if so, what would one look for when they are testing it to determine it is faulty?
2. Does the alternator regulate the volts going to the battery?
3. If not the alternator, what else could cause the volts to jump?

any wisdom would be greatly appreciated.

cat

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Tuesday, May 13th, 2008 AT 12:27 AM

2 Replies

Tiny
BMRFIXIT
  • EXPERT
  • 19,542 POSTS

You can check the alternator with a volts meter
I would suspect bad alternator from your description
but you need and should check battery terminals and alternator terminals and wiring

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Tuesday, May 13th, 2008 AT 6:18 AM
Tiny
SOKRAT GEGA
  • MEMBER

Hi
Check voltage must to be 14.4 volts max not more if the voltage going 15 or 16 volts the problem. Is alternator you can repair just to change voltage regulator and diodes
Sorry for my bad english

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Tuesday, December 6th, 2016 AT 2:01 PM

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