I have a Garmin Zumo 590LM that I picked up used and have not mounted it on the bike yet, but am hoping to do that in the off season. It has the usual inline fuse in the red wire, and has the black ground wire but then it has 3 plugs that look sort of like RCA jack connectors and are labeled Audio in, Audio out and Mic in. I assume the bike will not have the corresponding hook-ups built in.
Has anyone used this same model of GPS, and if so, how did you hook up these 3 connections?
I have attached a picture.