Replacing whip on AC condenser
If you have two colored leads and one green then it does not matter which place the red goes and which place the black goes.  They are interchangeable. The green or 'bare' wire is not interchangeable with either of the colored leads. The Green must be the ground and it goes between the container of the disconnect to the body of the condenser.  No place else. The colored leads well interchangeably go between the two pole fuse block or the two pole breaker in the disconnect and land on the two pole contactor in the condenser.