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Around how many volts should be show on the voltage gauge on the boat when running about 3000 rpms. I'm killing both batteries when I'm out on the lake ridding and listening to the radio. I think I got a bad alternator but not sure, it never show over maybe 12.3 or 12.5 when running down the lake but no higher. At idol it's only showing about 11.8 or so just under 12. This just seems low, how can I test my alternator? Can I just unhook my batteries and see if the boat dies real quick.
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