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Low voltage with squeal during acceleration

New battery one year ago, because battery drained; May 2012 voltage drop and van would not start, unless charged battery, and then would keep draining; installed new alternator and serpentine belt end of May 2012; end of December, voltage dropping to 10 or 11 while driving with dash lights and headlights dimming and brightening, but no issues with starting and no noise associated; Battery tested good. New noise under hood during acceleration and ongoing drops in voltage; (This noise sounds the same as what you would hear IF you had power steering issues and turned the wheel sharply.) Beginning of January 2013, noise increase..sounds like belt is squealing, but only during acceleration; voltage is low after letting vehicle sit over night, and remains around 10 or 11. If I drive to the store and shop for 15 minutes or so and go back to the van, it has a normal voltage of 14 from that point on, while I drive and run errands. The squeal remains, though. Took it to Meineke and they did an inspection manually and with computer diagnostic tools, but, they could not find anything wrong. Help. Opinions and advice appreciated. ~ HHH

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Posted on Jan 02, 2017

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SOURCE: 97 Chevy Blazer - good battery, good alternator...still dies???

if you removed the dome lightbulb then there is no longer a draw from the battery there but if the ashtray light light does not go out then over a period the battery will go dead or drained to the point to not the vehicle

Posted on Mar 05, 2009

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SOURCE: 97 Chevy Blazer - good battery, good alternator...still dies???

check battery voltage when you turn off car. it should be 12.5 volts.if drops 11.0 volts the battery is got a weak cell in it.i bought a sears die hard battery it last 2 years the battery had a defect .it had a bad cell it short out the battery.check alternator wires for defects.

Posted on May 29, 2009

  • 7 Answers

SOURCE: 2002 Chevy s10 electrical problems

Not to well versed on the S-10 electrical system but I would take a look at the voltage regulator.
It sounds like there is a malfunction that charges your battery sometimes but shorts out the alternator other times. Try having it tested or replace it
WD-40 will not do the trick for cleaning your terminals. WD-40 was developed during the 2nd WW to combat moisture in radio equipment in the South Pacific. WD stands for water displacement and the 40 is for formula #40. To clean the terminals you must disconnect them and use an abrasive such as emery cloth to remove the corrosion. They should be brite and shiny when you put them back together. I always cote mine wit dei-electric grease before re-assembly

Posted on Nov 21, 2009

  • 3 Answers

SOURCE: Charging problem on 2005 Suburban - gradual voltage reduction

This vehicle has a "Regulated Voltage Control" system. The computer reduces the charge voltage based on several parameters to improve gas mileage. Normally it shouldn't be a problem, but the computer will increase the voltage if you switch on the headlights. Also, if you're in Tow/Haul mode the voltage will increase.

Posted on Dec 01, 2009

fixitriteman
  • 431 Answers

SOURCE: When driving my 2002 silverado my lights will dim

Most likely it is the voltage regulator in the alternator . this is common of a alternator be for going bad, some times this is caused from jump starting.rarely it could be a intermittent short. but it would save a lot of time to have the alternator Thrilley tested or even replaced.it really don't mater about the volt out put.if the reg. is failing .hope this helps .if you want any further assistance feel free to ask.we are here to help.

Posted on Apr 06, 2010

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ENGINE HESITATES WHILE ACCELERATION
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http://technoanswers.blogspot.in/2012/07/2004-dodge-town-country-jerks-and.html
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http://technoanswers.blogspot.in/2012/02/loss-of-acceleration.html
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Headlights flickering and car hesitates to start?
http://howtobyme.blogspot.in/2012/02/headlights-flickering-and-car-hesitates.html
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http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html
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How exactly Vehicles Accelerator Pump Diaphragm Works?
http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html
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2000 Toyota Avalon: Engine Lean Codes and Knock Sound on Acceleration?
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These details will help.
Thanks.

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2) With all vehicle doors closed, alarm off, lights off, radio off, and all other accessories off, wait for around 20 minutes and then read the ammeter. A healthy system should read about 0.03 amps and little more. If reading more, then the vehicle could be suffering a parasitic amp drain, and you will need to locate this issue.


3) Reconnect battery when finished.


If no major parasitic drain present, yet low battery voltage then:


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2 Answers

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You need to check for something that is a constant drain on the battery.
Is the underhood light staying on?
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