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When a car has two batteries how do you know which one is dead?
Wiki User
∙ 16y ago
The only real accurate way to test any battery is to make sure it is fully charged, before testing. I have to assume you have a vehicle with two 12 volt battery's and a 12 volt ignition system? Make sure all connectors have been fully cleaned and checked for a good contact with all electrical components. Disconnect the ground on one battery and you can either load test the other battery..by using the vehicle starter or the headlights, to perform a load test. Then repeat the same test by disconnecting the negative cable on the other battery. Then connect the first one you disconnected. The key being cleanliness, fluid levels, Hydrometer test and load testing, as well as clean tight connections. And of course your charging system on your vehicle should increase to an estimate of 13.7 to 14 volts when charging. Good Luck. Buy a inexpensive volt meter from Discount store.
Wiki User
∙ 16y ago
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Red battery light on Orange engine sign lit up car wont start?
you got a dead battery. go buy another one
How do you know which cylinder head is the right one or the left one?
When your sitting in the car facing forward your right and left arms are the same as the right and left side of the vehicle.
How do you know if you need a new car battery?
That is a 50/50 chance. A battery bought in 2003 might be still good today, while a battery bought 3 months ago might go bad.Asking how do you need to know if you need a car battery is like asking when you tire will go flat if you running it too low. You just don't know, however if you turn your car over and it seems like it is cranking over for a few times before it starts, take your car to a garage that specializes in auto electrics and batteries. They will usually test your battery and charging system for free. Another way is to take the battery itself to a car parts store and they will usually test it for free as well.Some other reasons a car won't start may be nothing to do with the battery at all, such as a faulty starter solenoid or starter motor or some loose wiring or a faulty ignition coil.Regarding the battery, another possibility is that a it can lose its charge and die if the car has been in stilling or storage for a long period of time without having regular top-up charges.For more information see the answer to the Related Question shown below.
Should you charge a new car battery before installing?
It depends on how long the battery has sat around from where it was purchased. Its never a bad idea to fully charge a battery before its first use. Most new batteries only have roughly an 80% charge. An alternator is not designed to full charge a battery but maintain a healthy one. By charging a new battery you ensure that your getting the most out of it by not allowing sulfation from charging and discharging to the batteries original 80 percent.
Average cost for an auto dealer to replace both back wheel bearings on a car?
We need to know the year, make and model for that one, it makes a difference.
What is one reason that batteries are bad?
Assuming you are talking about car batteries, the most common reason is that they are either dead or fried.
Why is my car not changing gear after dead battery?
Gear shifting has little to do with batteries, or your car's electrical system. If your car is stuck in one gear, your clutch (on a manual) or even worse, your transmission, might be going out. The dead battery might be just a coincidence.
Do car batteries run out?
Yes,they do. and if a cars' batteries run out you have to get a new one.
Where can one find more information about car batteries?
You can find more information about car batteries online at such websites as AutoZone, AC Delco Car Batteries, and Walmart. There is also a consumer report site that gives reviews on different batteries.
Where to buy car batteries?
There are many great online locations where car batteries can be bought at really great prices. One of the leading sites is autozone.com and they have a large selection of batteries.
How much are car batteries for a 2006 Honda Civic?
The price of car batteries for a 2006 Honda Civic depends greatly on where you purchase it and where you live. Battery Outlet usually has the cheapest car batteries if you have one in your area.
Do batteries contain acid or alkali?
Either one, depending upon the type of battery. You can get Alkali Batteries for your toys and flashlights. Car batteries contain acids. It requires one or the other to create the ionic differences that produce the current flow.
What is the differences between a petrol car and a battery car?
one is run by petrol and one is run by batteries...?
How many lead batteries are in a car?
Normally there is one lead acid battery in a car.
What will cause a car to die after battery goes dead and then jumped to start?
The battery just isn't holding a charge. Time for a new one. Batteries can die suddenly like this.
Where can I find information about car batteries for sale?
There are a number of places one can get more information about car batteries for sale. I would shop around at places like Advance Auto Parts, Interstate Batteries, and Auto Zone.
How do you connect two batteries in one car?
If the car is a 12 volt system, then you will want to connect the batteries in "parallel". IE: negative to negative and positive to positive. Because of "cranking amps" it would be advisable to use a cutoff switch when starting the car. (The switch would interrupt the power from one of the batteries so the amperage wouldn't toast the starter) Also, the alternator should be isolated as to charge the batteries one at a time.
