Interference??

[westmdbass21502]

As you can see I have Garmin strker 7" and can see only when I hit pedal or keep on pedal i have interference i have a 24 volt  digital motor guide, fishfinder is going to own battery,i have two small chokes on power cable,i have taken transducer of motor head and put in water,still interference,can not figure out where getting interference,transducer maybe bad?? 

[WRB]

It's a ground loop problem. Your sonar unit is ground to the TM and need to be separated, each with it's own ground path.

Tom

[westmdbass21502]

Tom so you saying running 2 16 or 18 Guage wires to the ground side of battery one of skeg of trolling motor and fishfinder

[Mjmj]

Before you go crazy running wires, try disconnecting your battery charger wire that run to the battery your unit is on. Then try. It might be back feed through your charger 

[WRB]

From the photo you have a glass bass boat. You need to connect s ground wire to the trolling ground running from the TM batteries. Your TM may have the ground to the TM metal bracket that may not grounded. If the TM bracket has nylon bushings for example you may not be grounded to the water via the TM. Your OB engine shouldn't creating any interference if it isn't running. You would see interference on the console display when the OB is running if the alternator is the problem.

Tom

[westmdbass21502]

No tom I have a plastic boat and I do have a onboard charger so I will disconnect and get back on the water and see what happens,thanks guys will keep ya posted