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How do I charge a battery in the car

Do I disconnect the cables first

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It is usual to clip the red and black cables from the charger to the battery terminals leaving the vehicle connected to preserve the radio settings. If you are trickle charging, less then 5Amps, use the cigar lighter socket to charge through.

Posted on Nov 10, 2014


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SOURCE: after charging battery, engine will not run right

i wont try this one sound danagerous

Posted on Jul 16, 2009

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1 Answer

How to charge a battery?

No , other wise the 'charge ' will go through the vehicle's electrical system as well , best to remove battery completely unless you have a big enough garage or similar , but you must disconnect the battrey leads and trickle charge for 214 hrs

Nov 10, 2014 | Subaru Outback Cars & Trucks

1 Answer

How to charge a car battery while battery is in the car

No, do not disconnect your car's cables. Connect positive cable to positive one on charger cables, & negative to negative. Attach to DEAD battery FIRST. Then attach to car that's giving you a charge. BOTH CARS MUST BE OFF DURING ATTACHING PHASE. Then the car giving you a charge must start theirs. Let both sit like this for a few minutes (usually 3-5 minutes is plenty). Then try starting your car. If not charged enough, turn yours all the way off & continue charging for longer period of time. YOU DO NOT REMOVE THE CAR's OWN CABLES AT ANY TIME DURING OR AFTER THIS PROCESS, BUT ONLY WHEN A NEW BATTERY IS BEING PLACED IN YOUR CAR.

Nov 10, 2014 | Subaru Outback Cars & Trucks

1 Answer

Car will not hold charge

I will try and answer this. Most responses you will receive will have you looking for a drain in the system. Very well could be that.

But you said when Jumper cables are removed it does not charge. I have not heard of this in your Year of car, but witnessed it myself in a 2004 F150. There is a circuit called a "battery saver". Its job is to disconnect a battery drain to preserve the battery. What can happen is the Alternator uses power to make and generate even more power.

When a battery is not fully charged it needs a higher rate of charge and the Alternator may be viewed as a parasitic drain. The battery saver activates and disconnects the charging circuit. It can cut off at even 70MPH. I have seen F150's charge for about 5 minutes after removing a jumper and then cuts the battery charging circuit.

You need to be sure the battery is 100% charged. You need the car checked for things like the Diodes and starter draw. If you take the Alternator or Starter for a bench check it will not show how the wiring is working in the car. It is best to check the whole car.

Feb 11, 2014 | 1996 Lincoln Continental

1 Answer

How to change the alternator on a 1991 amigo

Here are some steps that you need to do.
  • Disconnect battery ground cable at battery.
  • Remove drive belt.
  • Disconnect alternator electrical connector.
  • Disconnect battery positive cable nut on alternator.
  • Remove alternator
  • Put the new alternator
  • Connect the positive cable nut and electrical connector
  • Connect the battery ground cable
  • Start the car then check if its giving enough charge to your battery

Jan 02, 2011 | 1991 Isuzu Amigo

1 Answer

1985 ford LTD - replaced alternator & battery, checked wiring OK. Car will start but cuts a few minutes later, also not holding a charge.

Are you sure that is a charging problem?Check if the carb injects gas at the moment the engine runs off,if there is spark on the ignition cables,as for no holding the charge,make this tip,disconnect the positive cable of the battery and get a multimeter,connect one terminal to the battery post and the other terminal cable,and disconnect every fuse and relay and possible part that consume a charge,one part at the time,when the reading on the multimeter goes down you did find the problem that its consuming the charge.

Sep 29, 2010 | 1985 Ford F 250

1 Answer

Proper positive and negative disconnect sequence and precautions for electrical system when charging battery

we usually recommend removing the negative terminal first, but this is only to reduce that chance of shorting your wrench when disconnecting the positive side. You do not have to disconnect the battery to charge it. Just make sure you connect the red charging cable to the positive battery terminal.

Sep 04, 2010 | 2006 Cadillac STS

1 Answer

Starter repair problems

you probable burnt up your altenater.

Jun 10, 2010 | 1995 Buick Skylark

1 Answer


You problem could be one of two thing a charging problem or a battery dying. yes you can get the voltage but not get the amperage to charge a battery. Do the lights dim at idle and brighten as you accelerate? Does the car continue to run but the battery goes down after sitting for a while? DO NOT DISCONNECT THE battery cables with the vehicle running as this can result in damage to the charging and other systems. Here are things i look for (1) does the car start on it owns without a jump? (2) does the vehicle idle smooth? A dying battery uses more charging load on the alternator and can result in rough idle and poor performance and gas mileage. (3) this is an odd one but but has helped int he past, does the battery smell like rotten eggs? When a battery is dying it can stink when it is getting a charge from the alternator. To be sure go to your local auto parts store for a free battery and charging check. Takes few minutes and no cost. Hope this helps.

Mar 05, 2010 | 1988 Mazda MX-6

2 Answers

Draw on battery when car on

First disconnect the battery overnight just to make sure the battery is not self discharging......if it's dead or down in charge while disconnected....time for a new one.
Now.....if the battery is good....disconnect one battery cable and place a 12 volt test light between the cable and the battery post the cable had just been attached to. A bright light means a drain in the car.
Your job is to remove one fuse at a time until the light dims.
A dim light is OK...clock memory etc.
Remember....a open car door is a drain......the dome keep them closed while pulling fuses.
Also....if the fuses don't show a drain......disconnect ALL wires from the alternator....there could be a drain there.
Just keep disconnecting one thing at a time until the light goes out or dims.

Aug 12, 2009 | 2001 Volkswagen Jetta TDI

1 Answer

Left lights on Suzuki Vitara and now can not unlock the door

Can't help with a problem of getting into the car, assuming the keys don't work. As for charging the battery, make sure all accessories are off in both cars, hook up the cables to the dead battery first, noting which one goes to the + cable on the battery. That same cable will go to the + terminal on the car that is running. Make the last connection the one that goes to the - terminal on the running car.
Let the battery charge for 2-3 minutes and then try to start. If it doesn't start after 5 minutes, rev the engine on the jump car and that will add voltage to the connection. Try to start again after a few minutes. After you get it going, let your car run for 20 minutes to build up the battery. When disconnecting the cables, keep the ends from touching until all cables are disconnected from the batteries.

Mar 14, 2009 | 2003 Suzuki Vitara

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