I have an 06 TL, have new battery, alternator, & starter. Battery light just started coming back on a day after new alternator was installed. I need help!!! What else could be going on???

 

Check your grounds and battery terminals and cables

 

They look good, clean & thight

 

Could be a faulty alternator. It happens. Happened to me 3 times, before giving up and going to a different brand.

 

Did you physically take them off and look or just visually ... Doesn't take much to mess up a ground.

 

Did a visual, I'm gonna do a cleaning & see if that was the problem

 

That is the exact same problem I dealing with. Debating on getting an alternator. Sounds just like yours because all of my grounds look clean also.

When my battery is hook up, mines creates a fair amount of corrosion on the positive terminal regardless of how often I clean it. going to check mine grounds again, but I know for a fact it needs an alternator.

 

I just replaced a battery (Thanks Aaa) for this exact issue and it seemed the positive post had a slight crack that seeped acid and corroded the terminal. ( it ate through completely)


Ended up replacing terminal and same thing happened which led me to the post. Replaced battery and so far so good!

 

How could it have gotten that bad? Looks like it hadn't been serviced for years.


OP-Get a multimeter, inexpensive and can be used for multiple tests, home/auto, and check battery voltage @ 12.4 volts with engine off. Start car and see if charging @ 14 volts with test leads on the bat terminals, then on the cable ends.
If alternator was a remanufactured unit from a store e.g. AutoZone, then probably junk.

 

Like I said the plastic around the post had probably failed causing acid to leak out slowly and corrode it I replaced it with an aftermarket terminal and in two weeks, it happened again.


I swear I take care of her!!! I haven't even had the car for more than 2 years