Hoping someone can help me with this puzzle. My 1999 RX300 has a brand new battery yet it keeps dying if I don't drive it every couple of days. I had the alternator checked and it was fine (in fact the mechanic is puzzled on what could be draining the battery!) When I am driving the car, all of the lights pulse - both inside and outside. Any suggustions on what to check? Is there a voltage regulator somewhere?