I'd charge that battery up and see how much cranking voltage you're seeing with a good battery. I'd like to see that cranking voltage closer to 11v. These systems want to see 10v typically for on operation.
A good way to know if you're fluctuating between a voltage related on/off cycle would be if the engine will only fire if it lights off immediately. If you get excessive cranking it it never fires, the unit is probably not on. You may also find a situation where with the prime shot the engine will fire right away and immediately die. That could also be a sign of poor cranking voltage.
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-Jason
1969 Pontiac Firebird
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