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12.12V under no load is a discharged/fubared battery IMHO.
50% duty cycle (45 degrees dwell set to 4 cylinder) suggests either your o2 sensor is shot or your mixture is so far out that it doesn't know where to start to try to correct it, so it defaults to mid scale.
I'd make double sure that battery of yours is OK then I'd measure the base ignition advance.
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