I have a helix 12 chirp si G2 on console and a helix 9 chirp si g2 on the deck and they are linked together.. for some reason I have no DI on the front ducer and no 2d on the back ducer, and then sometimes have no si and di on back ducer at all and the 2d is funny on the front.. . I have unplugged the bow graph and still having issues. I�m guessing it�s some kind of interference messing with both of them because sometimes it does start working..even with everything off they still act up.. . they worked flawless up until the trip before last .. only thing that has changed is I added a mapping card and installed power pole foot switches.. any ideas guys Or a place areound fork that will work on Humminbird issues.. it�s probaly something stupid but it is frustrating since both are acting up..

Thanks for any advice

Start back with the basics and trace all the wires. Make sure everything is connected well and that wires are not bundled tightly together and there is no strain.Is your bow unit using a built-in transducer or a factory transducer strapped to the bottom on the trolling motor?

It�s a mega di ducer straped to trolling motor.. I�m taking next week off and will try and dive into it... I traced the wires at condole and they looked good, I�ve completley unplugged bow unit and the console unit was still acting up.. Ive been debating just wiring them directly to the battery.. You think that would help??? Thanks

Did you change the Connected Transducer setting of the H9 to match the Mega DI transducer?
Did you get the proper DI transducer for a trolling motor application?