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Anonymous Posted on Jul 29, 2014
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Why does my H1td battery voltage drop when driving alternator was changed did not fix

While driving battery looses voltage changed alternator but still not fixed

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etep1958

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  • Posted on Jul 29, 2014
etep1958
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Battery cables? Sometimes cleaning off the battery cable connectors at the battery posts will not fix the problem. Corrosion can also penetrate the stranded wire and reduce the amount of current the cable can transfer to the connectors. Also, most people never check the other ends of the cables. Check where they bolt to the starter motor and the engine block/vehicle frame etc. Also, some after market accessories or several together can exceed your stock alternator's rated amperage output. Using those accessories will drain the battery even with the engine running especially while other electrical options are in use such as headlights, AC, etc.

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  • Posted on Jul 29, 2014
Gary Fessler
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Did you clean the battery posts? A dirty connection will cause a loss of charging. If the conections are clean have your battery tested at a local auto parts store.

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5 Related Answers

Anonymous

  • 4 Answers
  • Posted on Jan 31, 2009

SOURCE: Voltage Gauge drops suddenly to zero

Charging system grounding out, poss inside alternator

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Anonymous

  • 4669 Answers
  • Posted on Mar 11, 2009

SOURCE: Battery dosn't charge, alternator/voltage adapter test's good.

Did you test the Alternator on or off the truck? It might be a problem with the control system to the Alternator. The regulator need a battery feed to work, It is usually ran through an alternator fuse.

Anonymous

  • 27 Answers
  • Posted on May 11, 2009

SOURCE: battery light on.

some ford vehicles have an external voltage regulator. when theres more demand for power it gives it. but when theres too much itll lower it so it does not overcharge. at 1600 rpms there is more demand, plugs firing with more fuel in the cyl, if the alt is working properly the regulator could mess up and stop power from the alt. its a cheap fix or tryout...another big problem is ground if the system does not have an adequate ground nothin would work as it should.

Anonymous

  • 1392 Answers
  • Posted on Jul 02, 2009

SOURCE: Battery indicator after new alternator Audi A4

Take it to an Audi dealer. Could have been a bad alternator, and another bad alternator if they didn't use Audi part. Don't use cheap rebuilt Chinease stuff on your Audi.

mecanica03

ROBERT GARCIA

  • 926 Answers
  • Posted on Jul 30, 2010

SOURCE: battery light ford 2003 escape battery died short in main ig.

yes , repair the alternator

Testimonial: "Thank you I am having it replaced along with the Serpentine belt which has 220K miles orig."

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