Hope someone out there can help. I have a 1993 525 I. My computer gives me the message of "check brake light circuit see owners manual." I shut off the car and it goes away. I can drive it approximately 75-90 more miles and then all the computer messages come on along with the ABS, check engine light etc. I have lost all power. My battery checks out o.k. and so does the alternator. Something somewhere is sucking this car dry. Have checked the fuses but nothing wrong there. What do I look at next?