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I pulled the negative cable off the battery and the car stayed running but the battery is good

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  • Cars & Trucks Master
  • 501 Answers

Yes that is because your alternator is powering everything. If you pulled it off and it stopped then there is a problem.... Why is this a problem for you?

Posted on Dec 04, 2016

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

GM Elec
  • 1000 Answers

SOURCE: Battery and Alternator Good. Alternator not working. HELP!!!

djn, I believe you have some accessory that is on when the key is in the off position.
Check to make certain glove box light is not on when the glove box door is closed and the trunk light is not on.
If you have an aftermarket radio or any added accessories make sure they are not wired direct to battery voltage.
If all that checks out, disconnect the battery negative and connect a test light between the battery and battery cable. If the light is on you have a drain in the electrical system. Leave the light connected and begin removing 1 fuse at a time until the light goes out, that will tell you what component or circuit is draining the battery.
Last resort, you may have an alternator drawing the battery down.
Good luck and let me know.
Regards,

Posted on Mar 01, 2009

  • 6982 Answers

SOURCE: Battery grounding problem for ford taurus 98

Either the ground cable is loose or corroded at block connection . If cleaning this does not help, change the cable!

Posted on Mar 14, 2009

MNfisherman
  • 11896 Answers

SOURCE: cannot connect the negative battery terminal without spark or starter turning over

You will need new igniton cylinder. Sounds like you have a short in the cylinder.

Posted on May 23, 2009

  • 1168 Answers

SOURCE: battery won't stay charged

You say your test light was hooked from the negative terminal of the battery to the chassis? This is correct?
If so you don't have a short you have an open circuit.
You will have a bad ground somewhere between the battery and the engine or between the the engine and the body. Trace your grounds.
If you need more help leave a messege in "add comments" and I will help you along.

KL

Posted on Dec 18, 2009

  • 1201 Answers

SOURCE: Occasionally car will sputter and not accelerate

Hard to tell without testing different sensors.
Try having the throttle position sensor and/or the egr valve checked, one might be at fault. If both ok, further testing will need to done.

Posted on Aug 11, 2010

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1 Answer

1998 Ford Taurus can I test alternator in car running then disconnect battery cable


Yes, start it, pull the negative side of the battery. If it dies, the alternator is bad. To see the voltage out put if it stays running. Use a volt meter from the positive side of the battery to the negative cable while it is still off. If it is less than 12.5 volts, it still needs replaced. Because it can't keep up with the electrical of the car and keep the battery charged.

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What could be causing my van to pull so much power


First of all, is alternator charging the battery. Battery voltage when engine is off, should be at least 12.6 or better at battery posts.less than 12.4 with engine off. Battery is going bad. When engine is running at battery should be at least 13.8 to 14.2 or more if alternator is charging. You can go to any auto parts store, and get the charging system checked for free Advanced auto, Auto-zone, ETC, Good-Day! if battery and alternator are good. Heres how to check for a current drain. Disconnect negative terminal from battery, Hook a test light to the negative cable. connect opposite end of test light to battery negative post . wait at least 5 minutes, with test light hooked up. if light is on. Then start pulling fuses in fuse box, when the light goes out. thats the problem circuit.

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Batterie will not stay charged///the light comes on showing the battery


Not good to pull cable off batteries to test alternators an yes could be alternator or u may not have power to the alt.meaning the wire on top of alt or may havy bad plug wire boyh easy to check

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What is the problem with my mazda sting 160i 2002 model as soon as i use electrics like lights, wipers etc, the battery runs down. i've replaced battery, regulator and alternator 3 times already. It runs...


remove negative cable from battery, hook up a test light to the negative terminal. opposite end to negative on battery. start pulling fuses, when the light on tester goes out. thats the bad curcuit that is draining battery. wait about 3 minutes before pulling fuses. Good-Day!

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1 Answer

Battery goes dead when car isnt even on


You have something drawing on your battery. disconnect the nevagative cable. hook a test light between the negative cable and negative battery post and pull fuses till the test light goes out. when the test light goes out you've found the circuit that's drawing down your battery. trace the circuit and look for a short to ground or if something on that circuit is staying on.

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Battery dies after several days siting.


Much of the time this is a faulty alternator. It may be charging fine, but when the engine is off may still have a draw on the battery. To start with, you need a test light. Disconnect the negative battery cable. Connect the test light lead to the negative side of the battery and touch the test light probe to the negative cable. If you get a light you have a draw on the battery. that means the battery will be drained in a short time. Disconnect the alternator. If the light goes out it's a faulty alternator. If the light stays on, start pulling fuses one at a time until the light goes off. Do not pull all of the fuses at once! Pull one, if the light doesn't go off, put it back. When the light does go off, whichever fuse it controls is the problem. It's really not that difficult. Good luck.

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1 Answer

Need to know what code no. p0601 and p0622 mean


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Sounds like its time to replace ecu pcm. But try resetting it first. Remove negative battery cable and turn key all the ay for 1 min. Then pull positive off and touch the negative cable with positive cable and hold for 5 seconds. Make sure they are not touch battery terminals at all. Good luck

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Battery won't stay charged but the alternator is working good?


If the alternator is charging properly, then you have a drain on the system that could come from anything eclectically powered, you will need to start by removing the fuse to the radio and/or clock, then connect a test light from the negative post on the battery to the battery cable (negative battery cable disconnected positive connected), if the light comes on, you have a drain and will need to start pulling and replacing fuses one by one to isolate the affected system, if the test light has not gone off while pulling fuses, you may have a drain coming from the alternator or starter and will have to disconnect those.

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1 Answer

Baterry wont stay charged


Recharge battery then Start the car run to normal operating temperature. Disconnect the negative battery cable, the black one, from the battery.If the car stalls replace the Alternator. If the car keeps running then the alternator is Ok.Replace the Battery.Good Luck.

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4 Answers

Car keeps going dead overnight. we have checked the alternator and it is good, we just can't figure out what's wrong with it


You have a draw,something is pulling the battery down when the car is not in use,unplug the alternator,and let the car set over night to see if the battery stays up,make sure the light in the trunk,inside,and hood,are not left on,if the vehicle will start up the next day,then the alternator is bad.

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