Last week, I go out to use my car and the battery is completely dead. So
dead even the car clock isn't functioning. I see from my receipts that
the battery is 7½ years old, so I figure I'll just replace it, which I
do. I get an Exide with 700 CCA (basically same model as I bought 7+
years ago; no problems). I drove the car for 10 min., parked it, and
left it for a week. (BTW, electric windows, fan, etc. worked fine.) I
come back this morning and it is completely dead--not even the clock was
working (the same deadness that caused me to replace the battery).
At the garage, the mechanic tells me the alternator is putting out <13,
that the minimum is 13.5, and that I need a new alternator. As far as
the drain, he has no idea.
Now, the only thing I had happen to the first dead battery was a fuse
issue. The fuse controlling the interior lights went out. I mistakenly
popped in a 20 amp when it called for a 15. When the lights didn't work,
I discovered my mistake, put in the proper fuse, and everything was OK.
The car worked fine for a week, and then the battery problem.
So, any ideas as to what is draining my battery?
This car is an '84 Audi 5000 wagon. The battery is in the back seat.
I know it's old but otherwise it's in great shape. I'd like to keep it
around for a while longer.
Appreciate any and all help.