i had an older lowrance hooked up to the us2 cable and had no problems, since i have installed the 898 i get horrible interference when the trolling motor is activated, i have put chokes on the power cables to the trollling motor, the power cable to the 898 and on the transducer cable with no success, do i need to buy more chokes and put some on my food pedal cord also, thats about the only thing i have left to choke or i am going crazy, what other options do i have?