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And I left out the VRC-12 "power cable" nomenclature, which is listed in the -20: CX-4720 - one end connects to the battery (or 24 volt power bracket) and the other to the radio mount.

Boatcarpenter I uploaded TM's for two versions: TM 11-5915-223-12, for the MX-7777A/GRC (which is called the MX-7778/GRC when installed with the mount, cables, etc.). It does not have a battle override switch, and the two output connections are on the same side. TM 11-5915-224-14, for the...

As Bjorn pointed out, the 524 has a built in speaker. His diagram should answer most of your questions regarding installation. You can add a speaker to the crewmembers box if you don't have headsets (or don't want to wear them all the time) or just want to use a mike instead of the CVC or...