I had been dealing with the same anomaly for a year when I finally traced it back to the CCU.My vehicle is a '90 Carrera - C4 Cab. I do not use it often, maybe twice a month for a Sunday drive, so it sits unattended for long periods of time.This is the period in which the battery goes dead due to load drain. Although I haven't completed repair on it as of yet, I did install this Very Heavy Duty Competition grade Cut-Off switch in series with the negative post of the battery and the main ground connection where the negative battery cable used to be . Just before I lock the car, I pop the front lid, then lock it and finally turn the switch to the "OFF' position, close the lid and go have a "Cold One" knowing that my battery will not die over the next "resting" period.
No More dead battery when I want to GO!
Here is a peek of the switch...
Hope this helps!
Best Regards,
Tony
