Coincidentally my GS300 2006 55 plate also had the alternator die...frustratingly the week before I changed it in February. Car had 120k on the clock. In 5+years and 32k I think it and a shock absorber the only mechanical non-service parts I had to replace . On way to work, noticed the red battery warning light and slight burning smell. Got to work (~1mile). Drive to garage, ~3miles across city was tense but car made it. Roy's Motor Company fitted a reconditioned non-Lexus part. On a forum somewhere I saw a report of another same age Lexus (IS?) with alternator failure. After 15 yrs, an alternator must do a lot of work so maybe not so surprising some need replacing?
