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hello there ,firstly at the rear of the radio you will see two plastic blocks top block is your power in )secondly bottom block is your( audio ) sound these wires are colour coded for front and rear speakers ,your dc power which cannot be over 13.8v black and red wire on top block you have a socket to the right this will be for the antenna ,also check the fuse line before switching on hope this helps you
red is ignition power, or power when you turn the key on. yellow is all time power. yellow keeps power all the time, this keeps your presets and clock settings saved. black is ground. once you have then hooked up you will be able to figure out your speaker wires by trail and error, they my be green/green black, purple/purple black, white/white black, ect, but these are your speakers. Once you get the power on it should be no problem to figure out the speaker wires.
I have a XMD3 with Sirius on a Larson boat. Had same problem - everything seemed to be fine on unit (everything lit up and CD showed different tracks and time changing), but no sound. I suspected a ground problem and checked wires I could see. Found one speaker wire that had been frayed due to faulty installation. As soon as I wiggled that wire I got sound on all speakers. Not sure why one faulty speaker would kill all sound, but it did for me.