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Battery wont stay charging, cleaned grounds and terminals, alternator and battery checked out fine, ran a code scanner..nothing showed up. it will hold 14v + and when it gets to operating temperatre i

I have a 98 chevy s10 2.2l with electrical problems cleaned grounds and terminals, alternator and battery checked out fine, ran a code scanner..nothing showed up. it will hold 14v + and when it gets to operating temperatre it drains the battery and shuts off?

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  • Cars & Trucks Master
  • 22,095 Answers

Need my dirty hands under the bonnet here to be honest but i would suspect a faulty diode in the alternator ,when it gets hot is shorting out allowing the current earth out but i could be wrong

Posted on Apr 28, 2013

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Posted on Jan 02, 2017

cadman000
  • 607 Answers

SOURCE: 98 cadillac deville battery wont hold a charge

sounds like a 12V drain on the system, like a trunk or glove box light that won't shut off.> Could be many. many other reasons why. The way I would find the draining circuit would be to remove the neg cable of the battery. I then would connect a 12V test light between the neg battery TERMINAL and the neg battery CABLE. With a 12V drain the light will shine. I would install into the light a 9V battery powered recepticle to hold computer and radio station memory. Then I remove fuses 1 at a time, then reinstall, at the same time looking for the 12V light to go out. Hope this helps.

Posted on Apr 05, 2009

  • 17 Answers

SOURCE: new battery and alternator. Battery still won't hold charge

Check all your fuses if you had a system failure it could have blown a fuse. I am not sure on your vehicle where the fuse is in the car or under the hood it could also have a relay. You can check your alternator by checking the voltage at the back of the alternator where the big wire bolts on. You should have 14+ volts at the alternator.

Posted on May 24, 2009

  • 1162 Answers

SOURCE: Low voltage, the battery runs low when running the car

What is the voltage you are reading? Is it below 13.2 or so? Also have you checked the current with the engine off to see if something else is working that should not be on. I ran across this twice while working on a truck and car. A relay that was wore out keep trying to close and would drain the battery every couple of months. Sometimes you can hear them clicking or buzzing. Touching them sometimes they are warm or real hot. But that is not a sure sign it is bad. In my Trailblaze they get hot but are ok. Another thougth is the belt on your alt, correctly set to spin it at the right voltage. I have ran across this many times lately with serpatine belts.

Posted on Aug 04, 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

fordfixer
  • 58 Answers

SOURCE: Ford 2003 Expedition EB. Check Charging System

Its probably the alternator. It will need to be tested on the vehicle with the engine running and the light illuminated. Measure the battery voltage with the engine running. It should be at least 13.5 volts. If it is lower have the alternator tested at a shop with a charging system tester.

Posted on Feb 27, 2010

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My 1991 f250 battery keeps dying while running


The alternator is not working. When running, a voltmeter on the battery should be at least 13.5 volts, showing the alternator is working and the battery is being recharged. You have a charging system malfunction. check the connections between the battery and alternator. Check battery ground, engine grounds, and engine to body strap ground.

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98 s10 2.2L Charging Issues, cleaned grounds and terminals, alternator and battery checked out fine, ran a code scanner..nothing showed up. it will hold 14v + and when it gets to operating temperatre it...


What process did you use to check alternator ? Ive always taken it in to auto store to have it tested.. I don't recommend it but when its running you can disconnect battery terminals + from battery and if vehicle stalls out then its for sure alternator..

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Daughter hit a curb with a ford focus 2005 now the battery wont stay charged. Replaced battery all was fine started the next day. After driving the car died nothing worked got a jump and car ran like no...


1. Check all the cable connections on the battery and on the alternator.

2. If they are all fine then have the alternator checked because from what you have described it is not charging. The usual problem is worn brushes in the alternator.

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1 Answer

Alternator wont charge batteries


I can't give you more than generalities without knowing your vehicle model.
The alternator has several connections: Battery charge, Battery sense, and Field. The charge wire carries charging current to the battery. Since there is a voltage drop across this wire, a separate sense wire feeds the actual battery voltage back to the regulator module inside the alternator. The regulator then controls the current going to the Field terminal (a winding inside the alternator), which in turn controls the charging current. There may also be a separate Ground wire, but usually the alternator frame is supposed to be grounded through its mounting bracket.
The first thing to do is check each of the terminals for corrosion or loose connections. In particular, if the alternator has recently been serviced, or if somebody was working near it, check ring terminals on threaded studs to see if they have been left loose. Make sure the connections are clean and free of corrosion or arc burn oxidation, especially at the battery. Make sure screw connections are snug, but do not over-tighten - you don't want to break the connector stud.
If the connections and wiring look good at both ends, check the voltages on the terminals. The charge terminal voltage will be slightly higher than the sense voltage. The difference will be proportional to the electrical demand on the system. The field voltage will show a larger change with load (e. g., it should increase significantly if you turn on the headlights). Voltages must be measured with the engine running, so be very careful not to get the test leads or yourself caught in the alternator belt.

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This sounds like a bad battery. Remove the battery and take to to your local auto parts store to have them check it.

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1 Answer

New alternator didn't charge battery. (2VDC


As the car re-started, the battery is not flat.
The voltages measured indicate a problem with either the power or ground connection in the circuit between the alternator and the battery.

You likely have a intermittent / poor ground connection somewhere in the power system.
Check battery terminals are clean and firmly attached.
Check battery cable and alternator ground connections are intact and in good order.

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Check the alternator is charging.
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It is most likely either a dead cell in the battery, a faulty alternator, or voltage regulator. Take the battery to an autoparts store and have it tested. The alternator may be faulty which is why the system charging failure alert came on, but check the battery first and then the alternator. Hope this helped and best wishes.

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Check all grounds running from all electrical, If there is not a good contact this problem will occur, when you locate the ground surface take sandpaper or even a knife and scrape or sand the connector and the ground surface then reconnect it, It should return to normal if not then it could be a solenoid possibly but not sure

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