Not Ranked
I have not used the one wire alternators on a Cobra. However, my impression is that your alternator may be inconsistantly charging. It should read 14 or so running and 12 not running. If the meter drops to battery voltage (12) while running, I'd suspect the alt. Try this: Get a $10 volt meter and measure the battery while the car is running and the gauge says 12. If the volt meter confirms that the gauge is correct, I'd take it to a shop to have the alt tested.
Boudy
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