Question about Cars & Trucks

3 Answers

When I take one of my battery post off the battery while its running, the vehicle shuts off, what is it?

Posted by on

Ad

3 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Cars & Trucks Master
  • 5,317 Answers

Apparently the alternator is not working. Jerry, you should never take the battery post off a running car. Used to be okay to test the alternator that way, but that was before computers and modern electronics. Nowadays, you can easily fry computers, alternators, and other electronic components by doing so-not always, but always that chance. Disconnecting the battery even with just the key on, causes voltage spikes in circuits- very harmful to computer circuits that are low current. About the only way to test circuits is with a multi-meter. The best automotive multi-meter is a digital volt ohm meter (DVOM), and you can find them very reasonable at Sears, auto parts stores-anywhere.
So the alternator is not working... to continue: when the engine is running, all power to run all electrical circuits on the car is supplied by the alternator. Battery is tied in with the alternator, but no power comes out of the battery-it is being recharged by the alt.-recharged for it's next use of giving its all to the starter motor to start the car.

Test everything before condemning the alternator-could be something else not letting it work- Testing is the cheapest method to find the problem.

Posted on Dec 25, 2013

Ad
  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    New Friend:

    An expert that has 1 follower.

  • Expert
  • 123 Answers

On older cars, that's an indicator that you need an alternator. Have it checked though because newer cars rely on a direct 12v from battery for the pcm's keep alive memory function

Posted on Dec 25, 2013

Ad
  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Expert
  • 75 Answers

Altenator check for power on back of it if power replace alt

Posted on Dec 25, 2013

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My car turn off while running. When I try to turn it on it does not turn on & check engine and temp light does not turn on. When car gets cooler; turn on WO prob & check engine and temp light turn on.


Car shuts off while driving (vehicle, fuel, best, chip ...

www.city-data.com > City-Data Forum > General Forums > Automotive

Feb 6, 2014 - 10 posts - ‎10 authors
Car shuts off while driving (vehicle, fuel, best, chip) ... However, three times on longer trips (one the car was definitely running at 55 mph with cruise control on) she just cut... The first time my nephew was driving and she died. Engine starts but then sputters and shuts off after 5 ...
10 posts
Jan 22, 2014
How to tell if it's the alternator or battery..? (insurance ...
10 posts
Dec 2, 2013
My car turns off while actually driving! (plugs, fuel ...
10 posts
Aug 6, 2012
More results from www.city-data.com

Fixing A Car That Shuts Off Randomly - YouTube

? 3:37
https://www.youtube.com/watch?v=oBo-vmEEwv4
Sep 10, 2013 - Uploaded by Scotty Kilmer
My infiniti g35 2003 coupe randomly turns off while im at a stop light and ... If i have any gaps or hole would that make the van not stay running?

When I slow down and stop the car, engine shuts off ...



Jan 06, 2016 | Cars & Trucks

2 Answers

Automotive trouble shoting ford 350 super duty


i'd check the alternator. when an alternator is good, it helps keep the battery charged while the vehicle is running. when it goes bad, it can drain the battery when the vehicle is off

May 18, 2015 | Ford Cars & Trucks

2 Answers

2002 ford explorer, at off position, it won't turn over, not a sound. All lights work and windows work. We jump with a car and it starts right up. Or it starts right up after you shut it off but if sitting...


Have the battery checked ! sounds like bad battery ! You can check the alternator by hooking up volt meter to battery , with vehicle running should see 13.1 to 14.8 volts if alternator is good ! How To Check Charging System EricTheCarGuy

Feb 26, 2015 | 2002 Ford Explorer

1 Answer

Battery light came on and car wont start now when i shut it off


will engine crank?? if not, recheck battery cable connections. if vehicle ran until shut off, tells me that your charging system kept vehicle running until vehicle was shut off. alternator light can be related to faulty alternator and or bad battery.

Jan 17, 2013 | 1998 Pontiac Sunfire

1 Answer

Something is running all the time in my 2008 chey impala that brings the battery down


You need to measure the parasitic load on the battery.Roll the driver's window down,shut the door,open the hood(disconnect the hood light if it has one).I let it sit for a few minutes to let anything automatic shut down,then use a clamp style ampmeter to look for a large load.If there isn't a large load,then move on to an inline ampmeter.You will have to disconnect the battery(preferably the negative post),and connect the meter inline between the post and cable.It is adviseable to use a battery disconnect between the cable and post to power the car back up,and connect the meter at the post and cable after allowing the car to power up,then open the switch/knob to allow current to flow through the meter.(this will prevent the initial surge from frying your meter or blowing the fuse).You should see less than 50 milliamps on a typical vehicl(maybe a little more if you have certain accessories like an alarm system).If you see more,pull one fuse at a time until the load drops off.A common parasitic load I have found on GM vehicles is the lighted vanity mirror(s).The switch doesn't always shut off,depending if the visor is up or down.This draws about 500 milliamps,enough to kill it in a couple of days.The largest draw I ever saw was on a GMC Jimmy-the rear wiper motor wasn't parking correctly,and it was drawing 16amps!

Dec 30, 2012 | Cars & Trucks

1 Answer

I replaced the battery for Ferrari 599 model 2007 and after the replacement the vehicle wont start and showing on dash an elctro fault.


I am sure you installed the battery posts right Positive to Positivem newer vehicles ECM shuts it self completley thinking the vehicle is being stolen. Do you have an alarm system in this Ferrari? if so then that might have been activated.

Mar 01, 2011 | Ferrari 599 GTB Fiorano Cars & Trucks

1 Answer

Battery won't hold charge. replaced battery with new one approx 3 weeks ago. out of blue the battery lost charge to turn over, but lights, radio ect would come one. was able to start with a jump.


Could likely be your alternator. There is the possibility that the new battery is bad as well, but it's more likely that the alternator is going bad and unable to provide sufficient charge for the battery and other vehicle components.
One way to test this is, with the vehicle running, disconnect the negative battery post connection from the battery and notice if the engine shuts off. If the alternator is good, the engine will continue running.
If you suspect the alternator is the problem, you can take the vehicle to a local Advance Auto Parts store and they will check it free of charge.

Feb 03, 2010 | 1991 Pontiac Bonneville

1 Answer

My mercury cougar won't start, all lights are ok


Take another look at the battery, clean the posts and the terminal ends. Charge the battery, or jumpstart from another vehicle, and allow it to run for 5 to 10 minutes. Shut the vehicle off and see if it will start again. If not you will most likely need to replace the battery.

Jan 10, 2010 | 2000 Mercury Cougar

1 Answer

I can not find the neutral safety switch on a 2000 buick park ave


Any chance your vehicles have a security/alarm system. Disconnecting battery on some, will arm it sometimes & not allow it to run. Using key to unlock door, on driver & passenger side have been known to work on some vehicles, but if not, a call to dealer should help.

May 31, 2009 | 2000 Buick Park Avenue

3 Answers

95 chrysler starts, runs for 5 seconds and shut off. Gauges don't work


I suggest that you go to ALLDATA.COM and take out a subscription for ALLDATADIY, this access can give you unlimited knowledge about your vehicle. I have a repair manuel also between the two reference media I have solved most of the problems you are facing. Not to mention the problems you will be facing with a vehicle this old.

Apr 22, 2009 | 1995 Chrysler LHS

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

40 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

76164 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...