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First, I'm a little jealous that you got photos to upload.
You will need to identify which end has the power and which has the switch leg (wire going up to the light). The dimmer will need to go at the switch leg end. With the lights turned off, test for power at the black screw of one of the 3-ways. The one without power is the switch leg.
You want power-in on the black screw and out to the next device/load on the brass screw. The blue screw is communication. I always use the rew wire for communication as it is easier to trace. The middle device will have 2 red wires attached to the blue terminal.
You will need the dimmer functioning properly before you can program it.
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Thanks for the quick reply Radync. A couple of questions if you don't mind. First, I installed the MA-Pro in the location that had a four way switch figuring that this would have been the correct position. It had two red and two black and a neutral/white in the back of the box capped off. Would this tell me that this is the correct location for the dimmer? From lutron instructions they said that this can go in any of the locations but I figured I'd install it in the same place as the original 4 way (non-dimmer) switch.
In terms of figuring which end has the power, it's tough for me to do that now given that I already installed the new dimmer and the companions. I could try to reinstall the old ones but I wouldn't know which red/black wires go to which screws on the original 4 way. I can tell which side they would go on but not which screws (also no black screw on the original - just reds on one side and blacks on the other with no markings to identify which is in/out...)
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Ah. I figured it out. I was reading the IL lights incorrectly. I was counting from top to bottom and not bottom to top. So 3 and 7 were flashing telling me my black wires were backwards. Dumb that I misread the light indicators (I just looked at troubleshooting that said 3 and 7 and I thought mine were flashing 1 and 5 (counted upside down).
My old 4 way didn't have a black switch so I guess it was basically having to guess which black wire would go to black. All solved!
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