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Electrical system

Tiny
242MUSTANG
  • MEMBER
  • 1999 FORD MUSTANG
  • 4.6L
  • V8
  • 2WD
  • MANUAL
  • 1,000,007 MILES
GT model. Replaced battery and alternator now charging gauge on dash intermittent. Some days system charges other days the gauge starts dropping. It is crazy.

I have been replacing and rebuild alternator in the car too many times.
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Monday, April 30th, 2018 AT 10:17 AM

14 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

The first thing I would do is to use a voltmeter at the battery to confirm the voltage.

The dash gauge is not an accurate gauge to follow.

Can you check the voltage at the battery?
Roy
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Monday, April 30th, 2018 AT 11:36 AM
Tiny
242MUSTANG
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  • 8 POSTS
I will check this ASAP.
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Monday, April 30th, 2018 AT 12:05 PM
Tiny
ASEMASTER6371
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Okay, will be here.

Roy
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Monday, April 30th, 2018 AT 12:06 PM
Tiny
242MUSTANG
  • MEMBER
  • 8 POSTS
Thanks.
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Monday, April 30th, 2018 AT 12:29 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome. Please keep us updated.
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Wednesday, May 2nd, 2018 AT 4:28 AM
Tiny
242MUSTANG
  • MEMBER
  • 8 POSTS
Battery voltage reads good 12+.
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Wednesday, May 2nd, 2018 AT 5:34 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Okay.

Exact voltage? 12 is a dead battery. 12.6 is fully charged.

Is this with the engine running or engine off?

Roy
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Wednesday, May 2nd, 2018 AT 5:36 AM
Tiny
242MUSTANG
  • MEMBER
  • 8 POSTS
Off.
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Wednesday, May 2nd, 2018 AT 7:01 AM
Tiny
242MUSTANG
  • MEMBER
  • 8 POSTS
13.9 running.
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Wednesday, May 2nd, 2018 AT 7:01 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Should be 14 to 14.5.

Clean the battery cables and retest. If it is still that low, replace the alternator.

Roy
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Wednesday, May 2nd, 2018 AT 7:21 AM
Tiny
242MUSTANG
  • MEMBER
  • 8 POSTS
Cool.
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Wednesday, May 2nd, 2018 AT 8:30 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Keep us updated on your results.

Roy
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Wednesday, May 2nd, 2018 AT 10:03 AM
Tiny
242MUSTANG
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I replaced the alternator so far my problem is resolved.
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Tuesday, May 8th, 2018 AT 9:18 AM
Tiny
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Good, glad to hear it.

Good job!

Roy
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+1
Tuesday, May 8th, 2018 AT 10:17 AM

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