I have a ribbon cable that is not labeled and does not have a notch to prevent it from being installed backwards. How can I identify which pin is #1 on the connector?


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Pin 1 on a ribbon cable (the cable itself, not the terminators) is usually colored differently than the other pins - often red.

You are watching: What marking on a ribbon cable identifies pin 1


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Usually flat cable has one of it strand with a colored strips (usually red). So pin #1 will be on that side. if the pins are not lined up in the connector it will be the one the furthest to the side.


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Im not sure why sangretus response is doing so well. According to your post the ribbon is not marked. Additionally, the cable is just a wire so "wire #1" is arbitrary.

On the motherboard side osij2is is correct, they should have a #1 printed next to the terminal. On the other side your hardware user manual should help you determine where pin #1 is.


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