raynarine/garmin wiring???

I have a raymarine c70 and a garmin 176 gps. bought the boat used but they have always work couple off weeks ago they quiet. check the wiring and fuses,ever replaced the fuses..still didnt help. check the two to make sure i didnt change the settings both are set to talk to one another however recently learned that my gps and c.b. radio are connected into a black box..could this be where my problem lies???:huh
Any help would be appreciated...tnx

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