My is 250 was fine running strong and what not took my wife to work Thursday and by the time I got home the cd was skipping all the lights dimmed and I turned the car off... Waited while tested the battery it had good voltage. So I went and got a new alternator from oreilys put it in the car and still nothing so took my optima battery out of my supra and put in my Lexus still had to leave it connected to jumper cables for the car to stay running. So I took the new alternator out took it back up to oreilys and it Tested had a good charge... Any ideas any suggestions? Really need my car back up both r down right now!!!! Btw no warranty on the car... It has 70,000 miles on it.... If anyone could suggest or help this will be awesome.... Thanks