After changing the alternator 3 or 4 times. the battery 1 time i found that its not charging. each time i changed the alternator i had the charging system checked. they told me it was charging fine. then this last time less than 50 miles i checked the charging again. not charging again.please help. could it be that im using used alternators from ebay

Its the main wire from alt to batt thats worn out..from current. Put a jumpr cable wire in place til u get a new one

1. your battery needed to be checked with battery load checker. some batteries are producing 12.6 v or so but the current current capacity is bad.
2. also check your alternator if it delivers about 13-14 volts when idling to charge the battery.
3. your battery may still be ok if the alternator is the culprit and doesn't charge enough. replace or repair alternator if found faulty.
4. sometimes the starter is also filled with dust that insulates rotor contact terminals. depending on the mileage of your car, it may need some cleaning to get rid of the elecrtrical reistance these dust produces. incase you don't have time to service the starter, try gently whacking it with a hammer 2-3 times and restart your car. the vibrations will clear the dust debris inside your starter, hopefully,

if you replaced alternator 3 times , have you had your battery tested ? if battery is bad usually that will cause alternator to keep going bad . try having battery tested . might just need a battery

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.

have the BCM checked out for that can cause this problem to the display

Check the alternator for voltage output,worn belt and belt tensioner.

A health alternator should be produce 13.6-14.8V.

Any less it will put a drain on the battery.
(example: fuel pump,fans and lights)


Base on what you changed already,I recommend you to


1)inspect the tensioner wear indicator (two arrows,lines or dots) if they coming close the it's time to change the tensioner.

2)check the for worn belt. Look for cracks on the belt.

3)charge up the battery and monitor the voltage.

4)get the alternator check.
Most alternator can go up to 100,000 miles.
Some auto part store has a portable battery + alternator test.

Most likely either battery or alternator. Also clean all the connections. If its an old battery I would change the battery first. Though if you take out the alternator it can be tested. If you have any other questions let me know.
thank you,
Lee

alternator is bad. you have it checked at an auto zone. it can be on or off you car

I agree with you, it sounds like the alternator isn't charging the battery. Most parts stores offer free check of your charging system, with advice on what is wrong and what needs to be replaced (you should replace your mechanic along with your alternator.)

Mazda Mpv 2000 I also have the same problem, the alternater is testing good- 14.12Amp, so what is the problem the battery light will not go off.