I have a new battery (3Mo) and I have taken the car in and had it tested for battery and alternator. The front passenger window was not working but is now. The under the dash light of front passenger side was not working and now is. Had this problem last week, but then the car did fine. I drove three hours home and it hasn't started since I parked it.
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What do you mean by, "then it burns up alternator" ?
It is common for people to replace their battery assuming its bad when actually it is an alternator issue all along. A weak or dead alternator will make the car run off the battery until the battery is too weak to either keep the car running or start the car again after you shut it off. Have you taken the vehicle to an auto parts store that will test your Alternator, Battery and Starter motor for you with their test computer? Many offer this service for free and it only takes a few minutes. Another issue could be the battery cables and or their attachment points. Sometimes cleaning of the battery terminals works and other times the corrosion has actually seep inside the stranded wire battery cables and reduce their ability to carry the needed amperage. When that happens replacing the cables is the best bet.
Just had a similar issue with my 09 CVPI. Charge the battery, start the car. Car starts and is running, good. Now disconnect the ground from the battery. The car still runs. Battery or wire issues something is draining the battery. Car dies. The alternator is shot. Got to junk yard find one for your vehicle. My "battery" light came on and I pulled both the battery and the alternator too them to be tested. Both tested good on their systems. Did the above test and changed the alternator. No issues as of yet and no "battery light. Problem solved. Junk yard alternator $25.00, $5.00 core. New alternator $355.xx plus tax and $15.00 core. Core is money I will get back when I turn in the old alternator.
Where both rebuilt alternators any good & retested at store?
Your explaining a constant voltage drop, once the battery is hooked up.
How about the ignition switch? Does that have anything to do with the regulator control in alternator?
You haven't said you have 14 plus volts with motor running,so basically you don't have an alternator charging your new battery & the ignition currant, even without the lights on, is running down the battery
All I said is what you already know
I'm is missing something?
Don't unhook any battery cables with the motor running,were not living in the 1960's
Those type tests will ruin many things on newer vehicles, than yours,loose that practice & also avoid jump starting any vehicle from 1996 on
Sounds like something is drawing current out of the battery when shut down, the next step is to test for current going out, when shut down. DO NOT RUN the vehicle with the battery disconnected, or kill your charging system.
suspect items include the diodes in the alternator.
Well make sure everything is off. I know you said that but just be sure. Take car to dark place. While car is NOT running Disconnect battery + terminal. And tap + terminal on the + battery post and see if there is a small spark. If there is a spark? There is something left on somewhere on or in the car. if no spark? Battery or alteranator might be junk. Test the alternator by starting the car and while it is running remove the positive cable from the battery . If the car stays running the alternator is good and the battery is bad. If the car stalls when removing the terminal? The alternator is bad .
Either something is draining the power or your alternator is not recharging your battery. Do you have a DC voltmeter? With the engine running check the voltage accross the battery it should be about 14 volts. If it's down around 12.5 volts with engine running the alternator is not working. If you determine the the alternator is working and the battery goes dead, then there is a draw on the system. It could still be the alternator though, there are diodes in the alternator, a diode acts like a one way gate for electricity. With one bad diode the alternator will still work but, when you shut the car off the alternator drains the battery back down. Something is drawing it down, without testing equipment, you'll have to take it to a shop. Something you could try, after the car has been shut off for while, an hour or more, go feel if the alternator is warm or hot, if so it's drawing the battery down. Disconnect the battery overnight so it doesn't go dead on you.
sounds like a short circuit, check any aftermarket items first, a slow but easy way is pull on fuse at a time and check current flow from battery un til it stops, when it stops check fuse and see which system is draining