motjebben,
I have same problem with my 94 LS400 (have to push to the side of the road, instrument panel light flickerling).
-Problem caused by the Alternator went bad 110,000 miles.
-Alternator went bad because of Power Steering Fluid leak on top of the Alternator.
-Power Steering leak is very common with all Toyota that including Lexus.
Rebuid Alternator cost around $125.00 shop around from Alternator rebuild specialist (Lexus rebuild cost around $500 to 750 depend on early or late model of 94 LS400).
I own both Toyota Camry 95 and Lexus 94 LS400 they both leaks powersteering oil. Friends have Toyota most they told me that Power steering leaks too.
Power steering leeks usually cause by the brass ring (gasket) to tie between powersteering hose and power steering pump. Usually just need to tighten up without replace it on the big bold (this brass ring cost $6.00 from Toyota dealer).
