Post by startingover on Apr 14, 2020 9:43:27 GMT -5
I've done some research but hoping one of you has more concrete info than what I am finding. My 7TI unit runs fine for a while and then suddenly shows the depth at 1-5 feet. I know it has something to do with the big motor. The motor is a 1989 300hp Johnson. I've got the transducer as far over as I can get it. When it loses track, I can shut off the 300 and wait a few minutes and sonar will start working again. I then start the motor and sonar runs accurately for anywhere from 10 minutes to 30 minutes but it will eventually lose the bottom again. I shut the 300 off, it starts to read correct after a few minutes and the cycle starts over. I thought it might be because I had the power to the 7TI on the same battery as the 300 and as the motor runs there were voltage fluctuations on the battery so I bought another battery and have it dedicated to the sonar. Still have the same issue. Where the transducer goes through the back of the boat it looked like the transducer cable might be touching the power cables to the 300 so I put some thick pipe insulation around it so they cannot touch. I'm still convinced that the transducer cable is too close to a power cable somewhere but before I started digging into that I just wanted to see if you guys think I'm on the right track. Since it's an older boat, they didn't have the foresight to make running cables easy so you can't readily even see them. I had a *&& of a time even getting them run. Also, I did not have this problem at all last year. Just convinces me cables have settled together somewhere.
Am I on the right track? Should I be doing something else? It's not a show stopper but having the shut down the motor so often and wait for the sonar to pick back up is a PAIN!