One should start by measuring the voltage of the battery with the engine off. If you measure a low voltage then it is pretty easy to understand that this will not start the car. At this point, you could charge the battery, remove the battery and have it tested (which is free at a car parts store) and if necessary replace it by a good one.
Your car's volt gauge should read about 13.5 to 16 volts with the engine running. It should read 12 volts with the engine off. You mentioned the old battery had a lot of corrosion on the cable connections. Corrosion can cause a voltage drop to the starter, causing it to turn the engine over slowly or not at all. Auto parts stores have testers for batteries.
These simulate the load of the starter on the battery and measure whether the battery has enough juice in it. The machine can also test the alternator while it's on the car to determine if it is charging when the engine is running.
Also there is a quick and dirty test you can do with a multimeter (Note: these are pretty inexpensive and are very useful in other DIY projects involving any electricity.) . Set it to the "Volts DC" scale. With the engine running, touch the red probe of the meter to the positive "+" post and touch the black probe to the negative "-" post of the battery. It should read 13.5 to 16 volts. If it is less, the alternator may not be charging.
One should never disconnect either battery cable with the vehicle running/on, as it could cause an explosion, leakage, or serious electrical damage to vehicle.
You need to hook it up to a battery charger for several hours at 3 or 5 amp slow charge- then bring it to a battery store or maybe a kragen or pep boys auto store and they load test it for free.
How old the battery is generally your first clue. Most only last about 5 years. Second, are you in hot or cold climate? Cold weather drains a battery so the cold cranking amps on it have to be high enough to allow cranking of the battery in really cold wheather.
Age of the battery can reduce the power of the amps needed. Heat in really hot climate can also kill a battery over the years. If you can take it to a auto parts store they can put it on a machine to check to see if the battery is fully dead or is still good. If it is still good and just has a low charge, they can fully recharge it. If it is still in the car and you want to check it without going to the store, try to crank the car. If it drags a little and you are not in a cold climate it just may just need a boost (If in a cold winter climate it probably needs recharging).
You can boost with another car and cables or buy the instant boost sets they have out now (no other car needed and they work great). If it cranks with a loud turnover noise and the car just doesn't start it could be another problem. You also need to remember that the alternator is the equipment that charges your battery. If your alternator is bad the battery will just drain like a flashlight battery until it is dead. The alternator keeps your battery recharged as your car uses it while the engine is running. Just hope its the battery because an alternator is much more expensive.
For more information see the answers to the Related Questions shown below.
Turn car on remove positive battery terminal if car turns off alternator is bad
Typically you know your alternator is out when you have to jump start your car numerous times. A way you can test it is by turning on your car and while it's running discount the + terminal. If the car turns off then your alternator is bad. If the car remains in then alternator is good and possible bad battery. Hope this helps
It sounds like the alternator is bad. If the alternator is bad the battery will not hold charge when running
If the car won't start, jump it off. While it is running, remove the positive cable from the battery. If the car dies, then your alternator is bad. If it keeps running then you may have a bad battery.
If your battery doesn't hold a charge while running then your alternator is bad
Check for a bad fusable link at alternator
bad battery, and bad alternator not keeping it charged - also bad connections to the battery or loose wire connections on the alternator.
its either the alternator the battery is bad or a loose or bad wire on the starter
The alternator charges the car battery.
Yes it can as long as the battery is charged . The purpose of the alternator is to put the power used back into the battery
Yes it can as long as the battery is charged . The purpose of the alternator is to put the power used back into the battery.
let the car run and then pull the negative battery cable off. if the car stalls, the alternator is bad! do you know where the bank 1 o2 sensor 2 is?
Car batteries get re-charged by the alternator. If your battery recently went dead, "miles" is not what is measured to recharge the battery, "time" is used. I'd leave the car running for 15-30 minutes. Driving for this amount of time too is fine. If the battery goes dead again, probably a bad battery or bad alternator, or sometimes a bad alternator makes the battery go bad and they both need repaired. (typically a new alternator is $120 - $200)
Dead battery, car will not start
It doesn't actually drain the battery, but without a working alternator to recharge the battery it will only discharge as the car is operated.
turn the car on and wen is on, disconect the battery if the cars keeps on working is good,but if the car shuts off it means is bad
The quick easy method for determining a bad alternator or at least to find out if it is charging, while the car IS running remove the negative battery cable from the battery, if the car stalls then you need to have the alternator service inspected.
If your battery is always going dead a day or two after a boost, then it most likely the alternator. Two surefire ways to see if the alternator is bad is to take the positive (red) battery cable off after starting the car. If the car still runs, alternator is good. If the car stops running, then it is likely the alternator. The battery is just to turn the car on and then the alternator regulates the initial charge coming from the battery and that powers the car. Another thing you can do is to run a voltage check at either the battery or on the alternator with a Volt Ohm Meter (VOM). If the voltage comes back as 13.5V or better, than the alternator is good. Less than 13.5V, and it is likely the alternator. Be advised, though that what could look like an alternator problem could also be your ignition switch or starter.
Battery light usually means alternator not charging. Most common solutions would be be a bad alternator, bad connection, or loose alternator belt. A replacement alternator can be bad. If it is ok than most likely a poor connection to the alternator.
Either the battery is bad or the alternator is bad.
Could be a few things, weak alternator, bad battery, bad wiring. If you have a subwoofer in your car with no battery cap that will certainly do it.
A bad alternator will have the effect of draining the battery, resulting in dim lights, trouble starting the car and the like. It would be best to replace the alternator as soon as possible and possibly obtain a new battery. This may vary depending on how much the bad alternator has drained it. You can get your alternator and battery checked any time at Auto Zone.
Here is a test u can do to see if Ur alternator is good or not . when car is running disconnect the negative battery terminal it's the black wire.If car stalls then the alternator is bad if it doesn't stall then it's Ur battery is bad and u have to replace it
The battery will just run down and the engine will stop.
Why do you want to unhook your battery??? If the alternator is good the car will continue to run, if it dies then you have a bad alternator this is why you would want to unhook the battery cable to check and see if you have a bad alternator