Ok I got a 98 Ls auto sometimes I have problems with it starting and killing the battery ok I took it to advance auto parts and the tested the battery and they said it was a lil low but good and then they tested the alternator and tested it was not charging the battery. Ok so I took the alternator off took to auto zone and they said it was fine but sounded a lil funny so I got a new one put it on and the same the battery it reading 11.87v but now my battery light is on and my speedo is acting all funny sometimes. But it don't seem like its killing the battery fast I and still driving. Fine with it plz help

 

if your bat is reading that low while its on then one of your connections or grounds are jacked up or the ELD in the fuse box under the hood is causing the prob. If its the eld u have to replace the whole fuse box.

 

Charged battery should read 12.6VDC when the car is off, and approximately 13.8VDC when the engine is running (and no significant load, such as fans, lights, a/c).

If you are seeing 11.something while it's running, the alternator is not charging.

 

Ok so eld would stop the alternator from working. Or what would make a new altenator from working. How would I know if the eld is not working if its not throwing. A code

 

Is there anything else anyone can think of that can be making my car act stupid

 

Update change out the eld and a few grounds and check it with a halt merger and was reading 13v ok so I started driving it and the battery light keep coming on for a sec and then off again so I took it back to advance auto parts Nd the battery was at 11 again and theay was saying the alternator was not charging the battery again so back to the original problem plz help asap