DSC, ABS, and brake light on highway

[ScoobyDooBMW]

Originally Posted by estorilx53

Well today i checked my alternator if it was Good or not. I started the car BMW x5 4.6is 2002 with 140,000 miles on it . Car the voltage on the cluster reads about 13.5 and the i took out the negative on the battery terminal while the car was on idle and the car stayed ON and i check the voltage while the batt neg (-) is not connected and it reads 13.5 still and i so the "trifecta" symbols SHM

Any idea why the "TRIFECTA" light was triggered ????

You're lucky you didn't blow something. You don't test the alternator that way anymore. That was old school long ago. That's a no no these days with computers and such. At least that's what my good friend/mechanic tells me.