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Intermittent electrical / power problem
Posted by Tom Albert (more from Tom Albert) on Tue, 30 Jan 2001 11:41:40
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I've got a 94 9000 Aero 5-sp, 120K miles, with similar but not exact problem to that described in 14-Dec-2000 post by Benjamin Stalcup. My symptoms:
- With ACC in "auto" mode, while driving, when ACC compressor kicks on, lights will dim greatly, radio will cut out entirely, engine will stumble.
All this occurs only for 1 sec or less, then car functions normally, engine runs fine, radio resumes operation.
Occasionally, radio will lose power long enough to require security code to be re-entered.
Symptoms do not occur when ACC is switched to "econ" or "off" position.
Symptoms do not occur when car is idling, regardless of ACC switch setting.
Symptoms appear to happen more frequently when lots of electrical load is present, i.e., when heated seats, rear defog, headlights, foglights are all in use. Not positive on this, haven't investigated in very scientific manner yet.
Dashboard voltage readout is within range of 13.6 to 14.1 under idle and driving conditions. I believe I catch a momentary drop to 12.x volts at the instant the fault occurs while driving. (It happens fast and so far I've given priority to watching where I'm going but this may change if the problem persists!)
Alternator was given "ok" by independent SAAB-only shop last week, they also checked for vacuum leaks, found none. I suspect they didn't see the symptoms if they didn't road test the car so I'll quiz them a bit more on this.
Any help would be appreciated.
Tom
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