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If the battery is being drained while the engine is running it can only be because the charging system isn't charging or isn't charging enough.
When everything is working correctly the alternator supplies all the current the vehicle needs with a comfortable surplus that keeps the battery charge level topped up.
If the charging system is working correctly and the battery is becoming discharged while driving - the discharge fault would be so huge the result would be smoke and fire. As that isn't the case the obvious conclusion must be a charging system that is defective.
alternator replacement time-voltage with motor running should be in the 14.2 range-also take it to a good mechanic this job requires dropping axle and engine cradle-cheers Denny
unlikely, if it starts the battery is good because it just started the car and the alternator is good because it charged the battery the prior time it was running. i would put some thought into a fuel supply problem, such as the pressure falling off rapidly after a start; or something getting hot in the ignition systrem and failing causing a loss of spark.
you need to check voltage at the battery with the car running. The battery light indicates there is a problem with the charging system not necessarily the battery but the alternator. With the car running you should see more than 13.5 volts and better yet over 14 volts. if you see around 12 volts or less than you have a charging system problem and most likely the alternator has gone bad.
Have you notice any other symptoms like the loss of power steering or the engine overheating?
When you changed the battery did you check the cable ends to make sure they where nice and clean?
at the alternantor you should have a small hot wire from ignition call the alternator energize wire, this wire has to be hot to tell the alternator to charge. run a hot wire to alt and check charging.
It seems like there is most likely a bad connection between your alternator and your battery I would look into replacing those wires. That is far more likely than that many bad alternators.
If the alternator is what is going out,look at the alternator wiring,the large wire goes to the battery,it is hot all the time,do not remove it,just add a wire as large,or larger to it,and runit to the positive battery post,this will keep the alternator from working so hard to charge.
when you replace a alternator make sure battery is fully charged 1275 hydrometer reading on all cells. alternators will get hot. if you purchased from a cheap auto parts store with the lifetime warranty youll find out you purchased a life time of changing substandard parts (and they only replace 3 times)i would suggest you take it to a local rebuilder (whole vechicle) and have tested
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