I have a 95 teg gsr 5 speed. The run down- it has a 2 farad cap, 10in sub 600 watt amp brand new battery brand new alternator. For a few months now randomly the car wont charge the battery itll continuosly drop voltage down to 9v. Ive measured voltage on the batt in the car out the car. Ive measured the alternator at the alt at the battery both with same results alt is pushin 11.3 battery will hold 11.3 then out of now where itll go back to normal i checked the ELD its doing its job cut the car off and itll climb to 12 ish v ive disconected the audio system same results ive replaced the belt ive ran a ground from alt housing to chasis. Im at a loss as this is my daily.