A slider arm assembly for a cable carrier of multiple electrical cables connected to rack-mounted electronics equipment includes a slider arm having a base disposed for sliding movement within a channel of a slider arm guide connected to the vertical rail of an equipment rack, and a latch for releasably connecting the slider arm to the slider arm guide at different locations. The slider arm guide channel is C-shaped and has a plurality of notched in a sidewall of the channel, and the slider arm has a releasable latch thereon that that cooperates with the notches to connect the slider arm to the slider arm guide at a predetermined location. The slider arm is slideable within the channel to locate the cable carrier appropriately to align the cables carried in the cable carrier with I/O ports of the electronics equipment, and to move the cable carrier for easy access to the electronics equipment mounted in the rack.