my light came on and if revved up went out. then today came on and car started missing. light wont go off now so i figured it was either a battery or alt. had both bench tested. alt tested good at two different places. replaced battery still not charging and light still on. any help???? thank you

 

Check the alt ground. More commonly overlooked than you think

 

i checked the voltage at the battery with a volt meter then checked at the screw post on alt. with the engine off the voltage was the same. if you start the engine the voltage goes to between 130 to 140. any suggestions?

 

are the readings different when you test the posts on the battery then when you test the post on the alternator....if they are check the grounds as stated before but also check the positive lead that goes into the underhood fuse panel as this lead is screw in when it enters and leaves there and those screws can come loose