Generally Speaking...............The green wire sounds like it's a grounding connection.
You could confirm but taking a DVM (or VOM) meter and measuring the resistance between the ends of the green wires to the Battery negative (-) terminal. If you have zero (or near zero) ohms resistance, the most likely it is a ground wire.
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Roland Bedell
CC Models: 100, 105, 1450, 782, (2) 784, & 2072
Buy: Made in the USA 
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