Report "Bought a 987c si hd. i have a 917c on the front. I bought a inter link for them. when it is hooked up like the diagraphm says, that is 1) plug the puck into the gps port on the interlink. 2) run power to the puck cable. 3) run the choke cable down from the front gps to the unit 1 port. 4) run the choke cable with the extension to the unit 2 port. turn units on and the units do not work. I have no gps on either graphs. Whats the problem? thanks bryan"