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C900 Bulletin Board
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Re: 1992 900S constant battery drain 1 Saabers Like This Post!
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Posted by Bernie [Email] (#1501) [Profile/Gallery] (more from Bernie) on Thu, 8 Feb 2024 17:14:48 Share Post by Email
In Reply to: Re: 1992 900S constant battery drain, Bobwithasaab, Thu, 8 Feb 2024 14:47:59
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Hello,
Really you need to do a parasitic draw test. Which means you set a meter inline to the negative battery terminal and this will allow you to read the draw. The absolute maximum you should see would be 50 milivolts, so 20 would be great. Then the common way is to pull the fuses one at a time until you find the fuse that drops the draw down to acceptable. Sometimes it is not a fused circuit so remember the power distribution block on the passenger side that the one portion of the positive cable attaches to. Sometimes it can be an internal alternator issue. On a 900 it is usually easiest to detach to positive cable at the starter usually I just take off the jumper that goes to the alternator there.
A more modern method that sometimes lead to a quick discovery is using an infrared thermometer or thermal imager to find the warmer fuse or relay or anything. The current draw will cause a slight temperature rise in the fuse or relay or component. I often do a quick pass with the thermal imager before I pull out the volt meter. Just about any electrical device can be the draw but obviously some are more prevalent on 900. Good Luck, Bernie
_______________________________________
George Riggin Specialty Automotive
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