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Since ground is ground regardless of whether or not the engine is running, it shouldn't matter, unless you have a loose ground connection that is affected by engine vibration.
For starters, try it with the engine off. The reading should theoretically be zero ohms, but in practice every wire and junction has some resistance, so look for resistance well under 1 ohm, say .2 or .3 ohm. If resistance then jumps around when the engine is running, you probably have a bad connection. Regardless, Saabs are very ensitive to bad grounds and you should clean all your grounds with sandpaper to shiny bright.
If you do not have a good alternator frame to engine ground connection, your battery will not fully charge. In your previous post, you referred to a suspected overnight drain, but maybe your battery is bad.
After you have cleaned all your grounds and made sure that your alternator frame is grounded, why don't you put a voltmeter across your battery terminals when the engine is running. If voltage is 13.5-14 volts, your alternator is charging your battery. If so, your battery should not be dead every morning unless you have either a bad battery that does not hold a charge or you have a parasitic current drain. To check battery, any garage with a battery load tester can check if your battery is OK in a couple of minutes. If your battery is OK, then disconnect the negative (ground) cable from your battery and connect an ammeter between the battery negative terminal and the cable. This will tell you how much current is leaking when the car is not running. If you see 0.3-0.5 amps, then you have a big leak such as a lightbulb. Then begin pulling fuses until you see the current flow drop. You have then found a circuit causing a problem. Continue to track the problem by pulling fuses one at a time. Get a Bentley manual for circuit diagrams and trouble shooting info on specific circuits.
posted by 216.75....
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