Hello I will help you with your question,
I think the reason the ABS light is on is due to the high voltage in the system and that will set a code in the ABS computer as will having low voltage like you do now
Once you have a good alternator in the vehicle the system should clear the codes after a couple of starts and turn out the light.
I am surprised you were able to drive 75 miles on battery power alone, you got lucky.
Please let me know how I can help you with this
i took the alternator off and have one ordered should be in 8/20/13 - hope that this solves the problems.
Good, if you need further help please post the year, model and engine size of your Mitsu.