1970 didn't come with a electronic ignition.
Somone converted it and used a dual ballast - possibly because it was an early conversion.
On the early ECU's the 5 Ohm ballast regulates power for the ECU, and the 1/2 ohm resistor does pretty the same as the .6 - .8 ohm reistor on the points ignition (controls votlage and current to coil).
Hard to comment on specific wire colors.
Only green wire on the factory is for the field.
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