I'm having kind of a major charging problem that I need light shed on I on my 3rd optima redtop battery and my 4th atlernator in the last 11 months. I have an 86 fc n/a. I've checked all the grounds fuses and relays and they all apear to be good. The car just keeps decharging its self every day. The only thing I can think of is the ecu any ideas anyone, please and where I at the mazda dealers refused to work on the car because they don't have any one with 13b experience in there garages.

 

have you checked the wiring threw the interior? check the door and hatch switches one of my door switches would drain my battery but it never did anything to the alternator, is the alt charging the battery at idle and giving volt back? are you running a electric fan or some other type of strong electric load? if so you mite need to get a stronger alternator.

iv read up on here on them red tops and they seem to loose life pretty quit

 

I don't have power accessories in my 7, everything is all manual!