When you car is turned off your battery doesn't have the alternator pushing that constant stream of voltage to your battery to keep it charged. So your looking at a decrease in voltage by 2 - 3 volts while car is off. No part will fix this just simply start your car before you turn on your head lights.
Battery is dead?
Check the battery cables or starter.
You need to replaced the starter or the alternator.
Sounds like a bad alternator. The alternator runs the accessories as well as the charging of the battery, whereas the battery is resposible for start up. If you had to charge your battery that also means that alternator wasn't doing it's job and needs to be replaced. Its not a big deal to swap it out.
It sounds like you have a break in the wire which connects your alternator to your battery, get it checked out.
something is draining the battery. a new battery will last a couple days if just starting the car. even if your alternator is bad.
If the 2000 Cavalier has no lights an will not start, there is an electrical issue. Check the battery, alternator, and the wiring from the battery all the way to the starter to find the problem.
Dead Battery Failed Alternator, or a failed starter.
Im having the same problem, except for I just replaced my alternator, my battery is 2 years old, I have checked and tightend all connections on the battery, and it ohmed out at 12.5 volts... what the heck, I got jumpstarted after i replaced the alternator, drove home, and I turned my lights on and my car almost died electrically, let it run for about 20, shut it off, and now when I turn my key I get absolutely the dash of death, no lights or noises or anything... crickets chirping My question is: if you have no lights or power when you turn the key, and the battery and alternator are good.... what else can it be??
could be the alternator or starter sounds like the alternator if the battery is gone flat get the alternator tested at auto parts or garage jump charging the battery might get you out of trouble for a bit
you might need a new alternator. thas what happend to mine. Did any dash board lights come on and the radio start changing by itself?
Blown alternator fusible link. 140 A in a fuse box near battery
Have your alternator and battery tested. and replaced if required.
Defective alternator or broken alternator belt.
I'm no expert, but it could be a battery or alternator related problem.
The battery is basicly used just to start your vehicle, the alternator is what generates your power once the vehicle is running. Which indicates you need a new battery, not an alternator. That is why you problem goes away after a jump start(boost). If it was the alternator the problem would not go away and your vehicle would have no lights and stall with no start. Either your battery is bad or the alternator is not charging.
Starter Ignition Neutral switch
u might need a new starter
Yes, the car will start with a fully charged battery. But if the alternator is defective the battery will soon run down and the engine will stop once all electrical power is drained from the battery. You can drive maybe 15 miles in daylight with nothing on, or maybe 10 miles at night with your lights on.
The alternator generates electricity, so it's not part of the starting system, which uses the stored electricity in the battery. If the lights work, the battery must be pretty well ok. The starter might be stuck, or it might have failed.
AnswerDim lights and lots of clicks is an indication of too low a charge on the battery. When jump-starting, allow the battery to be attached to the jumper cables for about 5 minutes before trying to crank the engine. If that fails, check for loose battery cables at the battery, ground, or starter. If all connections are good, then the battery is too far gone and must be replaced. Note: You need to find out why the battery discharged - did you leave the lights on? is the alternator bad?.
As long as the battery is fully charged it will start no matter the condition of the alternator. Eventually the battery will run down if the alternator is not keeping it charged.
Yes, the battery starts the engine, and as long as the battery is fully charged the engine will start. The battery will loose it's charge if the alternator is defective and not replenishing the charge of the battery but the alternator has nothing to do with starting the engine.
Sounds like the battery has gotten weak. If the battery has been replaced recently maybe the alternator isn't charging it up. Some auto parts houses will load test the battery for you and tell you if it is weak. They can also check to see if it is charging the battery while it is running.