Alternator diagram Installed a new alternator and battery but the car still stalled out and acted as though the battery was dead. Could the alternator be a bad one or is my problem deeper?

Is the battery going dead while you drive or when it's sitting? If it's going dead while you drive check the belt and tensioner. Do this, turn everything on then start the engine and rev it several times then carefully touch the alternator pulley if it's real hot the tensioner is bad and you need to replace it and the belt, in many cases the alternator will need almost 15 HP to turn under load, I hope this helps. Take care. If you have any questions for me use comments and it will show up in my email.

What's the voltage at the battery with the car running ? Testing an not guessing is the way to do proper diagnostic's ! Battery light staying on , is there B+ voltage at the alternator connection's ? A new alternator won't make a bit of difference if no power to the alternator . Looking at a wiring diagram an testing the electrical circuit ,doing voltage drop testing , plus checking for DTC'S - diagnostic trouble code's . Some vehicle's charging systems are computer controlled . And looking at a wiring diagram i see your vehicles charging system is computer controlled . If you have done so already , take it to the dealer

I was having the same issue with my 95 GMC. I replaced the battery and alternator. It would start fine at times, at other times it would be sluggish. I finally took the starter off and had it checked. Turns out the starter was bad. When it would get hot, it would act as though the battery was dead. Replaced the starter and it has not acted up again. Have the starter checked. Replace if bad.

Sounds like the alternator / voltage regulator is malfunctioning or there is a bad connection to / from the alternator / battery.

Do you have a multimeter so you could test the alternator -- or could you take the car to a parts store such as Auto Zone where they could test the alternator for you ?

Charlie

check all the earth connections to the engine

Your description is not very clear--do you mean that the starter does not turn the engine over at times or that the engine turns over but does not "catch"? Or, does nothing happen at all when you turn the key?

In any case, it sounds as though you have a loose or damaged cable or a corroded connection at the battery or a ground.

new alternator and put battery on charge as well

the alternator is not charging and once you run out of battery power car dies when you let it sit battery builds a small charge enough to run short period of time.get charging system checked.

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.

This sounds like the battery is shot, or dead. Either that, or the main or alternator fuse blew. This is most likely a dead battery though. Install a new battery, and everything should be back to normal.

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