Power steering on car will shut off at random, an audible click will be heard when power steering shuts on or off, will turn on and off when going straight down the road or turning,having caused me to almost crash dozens of times. This will also happen when vehicle is stationary be at a stop light or sign, or even in driveway when vehicle still has yet to be driven. All dash board lights will also turn on and off, this sometimes coincides with the same timing of the power steering going on and off but not always. The red battery symbol will also turn on in dashboard. Exterior lights will have pulsing going on with bright and dimming. Power windows and locks still work properly during all of this. Center console (radio heat clock) will turn on and off at random also not necessarily all together. Battery and alternator checked with multi meter and working properly. This has been going on for several weeks now. Sometimes it wont happen at all other times it is constant on the drives. My rides are anywhere between 10-45 minute.change two time alternator still have the probleme need help thank you;

 

I believe there is a flaw in your checking of the alt and battery
If you are only taking static voltage readings , that is not the way to do the tests.