It sounds like you have multiple issues there. The GPS power doesn't have anything in common with the audio from the GPS or the intercom. That power comes through the connector on the back of the GPS on the left side. There are 2 other connections on the GPS (right side) the upper is the external antenna connector and the small 1/8 pin at the bottom is the audio out to the intercom.
"when I plug my cord in, the head set is dead as well."
I guess that you are saying the when you plug the lower cord from your headset into the Jack on the bike, there is no audio through the headset. Has this ever worked for you? You say that the radio and CD work fine....is this through the speakers only, or do you get radio and CD through the headset? Does the intercom work?
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747,891 miles on touring motorcycles since 1990
IBA 45658 MOA167437
2000 LTC 90,600 miles KIA (new)
2003 LTE 164,188 miles Silver (Purchased with 1687)
2008 R1200RT 176,196 miles (Purchased with 16458)
2017 R1200RT 96,669miles (new)
Total BMW miles 509,508
1982 GL1100 rode 84108 miles (bought with 12012 sold 96120)
1988 GL1500 rode 12067 miles (bought with 19893 totaled 31960)
1989 GL1500 rode 142208 miles (bought with 20302 sold 162510)
Goldwing miles 238,383