my cressida's been playing up too, blowing the engine fuse as soon as you turn the key. this caused the alternator to discharge the battery, and as soon as you turn the engine off, it won't start again 'cause the fuel pump wouldn't run. this was all caused by a short circuit somewhere, and it turned out to be the horn! the wire broke off the back inside the column cover and was touching the steering column, shorting everything out everything that ran off accessories.