You need to be sure all the outlets are wired correctly; do not reverse wiring in the outlets to correct for downsteam issues with your cables/gear.
Once you are sure about the outlets, you can work on the rest to get them all straighted out. My .02 is that you would want "polarity" to be the same on all gear.
As far as checking the wiring, one of the plug-in testers from a hardware store (~$5.00) is all you need.
Once you are sure about the outlets, you can work on the rest to get them all straighted out. My .02 is that you would want "polarity" to be the same on all gear.
As far as checking the wiring, one of the plug-in testers from a hardware store (~$5.00) is all you need.