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The main purpose on an alternator is to recharge current back to the battery. One of the most common problems with the Lexus LS400 and SC400 is that power steering pump seal leak. Right below the power steering pump is the alternator. The power steering fluid will drip down and cause many electrical problems for the alternator. Therefore, its very common to have the alternator go bad along with the power steering pump, just be sure to check.
As mentioned check ps fluid. If it wines when turning and still no power then the pump is internally bad.. If the fluid is dissapearing fast then its a hose or most likely a leaking rack& pinion assembly..
Check the power steering hose to the end at the steering rack. There is a good chance that the hose may be leaking or where the hose connects to the steering rack is where your leak is coming from. Note that power steering fluid is flammable and if sprayed on any hot surface like the exhaust manifold may cause in a car fire. Good luck and Auto Zone should have the replacement hose with the step by step instructions to replacing it.
that could be the rack and pinion leaking. as far as the noise goes, it is more than likely the same thing. have your local mechanic check it out because if its the power steering pump its cheaper to fix that than it will be to have the rack replaced.