Usually white will be the ground going to the lowest and usually a little more distance from others. Then simply get someone to push levels button on monitor and as you touch each wire separately to white wire or screw head it is attached to, the corresponding light at panel will tell you which is which.
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Usually white will be the ground going to the lowest and usually a little more distance from others. Then simply get someone to push levels button on monitor and as you touch each wire separately to white wire or screw head it is attached to, the corresponding light at panel will tell you which is which.