can anyone help i have a garmin gps 152 that i have wired up and working just by connecting a live and earth. I have just got a silva s10 and wired that up with a live connect and earth. How can i wire the two together there is a connection on the silva that has a red and black wire that it says for connecting to gps. Do i connect these to the live and earth connection of the gps or do they connect to any of the spare wires eg yellow, white etc of the gps