I have a Lawrence Elite-5 HDI with an HDI Skimmer 83/200 transducer (attached to the trolling motor by a Rig Rite Manufacturing 300 Marine Trolling Motor Transducer Bracket) and whenever the trolling motor is running I get what happens in the picture. It affects the downscale more as you can see but there is still some disturbance on the 2D sonar. I have read some other forms and websites about attaching a ground cable to the trolling motor but I would rather not get into all that if it can be avoided.

Any help would be great. Im going to try to move the mount further back as it is right at the front a trolling motor.

 

(EDIT): I have a minn kota fortrex 80 lb thurst as a trolling motor. The cable for the transduce is zip tided to the shaf of minn kota  and then taped down where the wires go o the plug,

Ok so you're getting some interference from the trolling motor.  The sonar should be wired for power to the starting motor battery and not the trolling motor battery, for starters.  The trolling motor itself may be putting out electrical interference or the power wires to the troller and the sonar can be routed so close together that the troller power line leaks interference into the sonar power line.  It could be a loose wire connection in either system.  It could be any numer of things or a combination of things.  Good news is that from your pic, it looks like the problem is fairly mild.  If it gets to really bugging you, you have to go back to basics and just start eliminating possible sources for it.

On May 15, 2016 at 1:46 PM, BobP said:

Ok so you're getting some interference from the trolling motor.  The sonar should be wired for power to the starting motor battery and not the trolling motor battery, for starters.  The trolling motor itself may be putting out electrical interference or the power wires to the troller and the sonar can be routed so close together that the troller power line leaks interference into the sonar power line.  It could be a loose wire connection in either system.  It could be any numer of things or a combination of things.  Good news is that from your pic, it looks like the problem is fairly mild.  If it gets to really bugging you, you have to go back to basics and just start eliminating possible sources for it.

Thanks for the reply. The unit is wired to a small circuit block that is hooked up the the cranking batter. I have put a shielding on the wire which I'm hoping will eliminate any interference from the trolling motor. Will keep you guys posted. Also my I have another unit hooked up to that fuse block and it works fine. I have hopefully eliminate everything other then interference from the trolling motor itself. 

 

Jeff

is that other unit a Lowrance too?