I have a 2005 bmw 545i and i bought the car non running. It needed a alternator bracket seal which i replaced and does not leak anymore. The car had a dead battery so i bought a new one and the car seemed to run fine beside the fact that it smokes badly probably from bad stem seals. Now to the main issue. The car ran fine for like 20min of driving and then suddenly the electronics started flickering. Starting with the navigation screen. Then the mph guage went to 0 multiple times, transmission wouldnt shift and just everything electrical. ALSO, BRAKE, ABS, TRIANGLE, AND lots of errors in the navigation screen came on. the engine seemed to run fine. Now when you rev the car, some lights may start to dim. What can this be?? ive tried unplugging IBS.

 

Alternator?

 

Im going to get one to see if it fixes the issue.

 

Fixed that issue, Thanks

 

So, alternator?