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Date: Wed, 26 Oct 2005 20:09:10 -0400
From: "Tom R." <>
Subject: Re: expected current draw when car is off

Our 1987 900S Turbo Conv did exactly the same thing and I narrowed it down to the alarm systems. Although the manual said you could shut them off, I could not completely shut down the second one. We would leave the car for a week and the battery was dead as a doornail. So I installed a kill switch at the battery. A lot of people told me that the kill switch has a high failure rate, but mine is simple. You have to remember to make sure it is tight when engaged. Now each weekend when we show up at our summer place, I turn on the kill switch, reset the radio code and the car starts without a problem. Tom R. "Mike Deskevich" <> wrote in message >I have an '87 C900 that seems to be killing batteries. After being > parked for 2 weeks while I was out of town, the battery was dead > (didn't even light up the dash board a little when I turned the key). > I wasn't too surprised, beacuse it had been getting hard to start over > the last month or so and the battery was 5 years old. So I replaced > the battery. Since my truck sits outside in the cold weather, I bought > a new battery for the truck and took the 2 year old battery out of the > truck and put it in the Saab. Everything was fine for another month or > so, and then I let the Saab sit for a week. It was very hard to start, > but it finally turned over. Then the Saab sits for another week and > now the battery is dead again. I realize that I put an old battery in > the Saab as a replacement, but I do know the battery was good. It > never gave me any problems in the truck. > > Before I buy another battery for the Saab I want to make sure there is > no short or something wierd going on. The first thing I want to look > as is how much current the car is drawing when the key is in the off > position. The only thing that I can imagine drawing power is the > radio to help it remember presets, and the ECU to help it remember > things that it need to remember. Everything else should be > disconnected. Does anyone know how much current should be drawn from > the battery when the key is off? I don't have a FSM or anything for > the Saab (and I know the FSM for my Toyota doesn't give this kind of > info). > > I don't want to put a new battery in to have it get killed so soon, > nor do I want to take it to $80/hr saab mechanics to look for a short. > So I want to do as much diagnosis as I can by myself first. > > Thanks! > Mike >

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