When turning key all the way over it simply does nothing what could it be

I dont know what is going on with my 528 i,2000 .it wouldnt turn over had all power ad expected.not noise when turning over key.was jumping it ay terminals.then one day it stopped jumping ad well still nothing .bought brand new battery.two days later today went to do body work then went to stary car nothing just ad before jumped it now nothing still.again.people think its the start r but now another new issue arose the windows and moonroof wont roll down either now.and took battety back got another one brand new.still nothing went from 14 v to 6 then 10. Still nothing whats going on anyone ,,,,help!!! Email is [email protected]...

Many things it could be.----is the battery dead ,turn lights on ,do you have lights? if so are they as bright as you would expect? if the car is auto matic try in neutral as well as park,still no go ---then check battery voltage , check engine fuse ,clean battery terminals,it is starting to sound like a dead cell in the battery and yes they do just die and you will still have lights etc , but nothing when you try to start try another battery or jump power from another vehicle BUT USE JUMPER LEADS THAT HAVE A RESISTOR,IF YOUR CAR HAS A COMPUTOR .....and if it has that could also be the problem, you have enough to start with if you have no joy ,come back and i`ll have another think
youdoit--------- [email protected]

Hi,
You'll likely need a new ignition switch. (The electrical side) You can confirm this by pulling the lower steering cover when issue is occurring, and using a test light on the black and yellow wire when turning key to "Start" position. If test light doesn't illuminate, replace switch. (Easy)

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