Echo chirp 93vs Interference!!

[C Parker]

I had interference from my trolling motor. attached picture shows a couple bumps on the motor before I addressed it. I drilled a thru hole in the skeg of my maxxum and installed a #10 screw with a washer/lock nut on the back. The hole was small enough so that it was an interference fit, or self tapping so that I had good bite into the skeg. I ran a 16-gauge wire from there to the ground block up under to bow where the TM is wired up to the battery wires.
For me this cleared up all the interference. also, I kept the ground wire and fishfinder wires opposite each other as much as possible going back up the trolling motor. Along with the Raymarine, I also have a garmin up front with no interference. Hope this helps.

So the ground from skeg hooked up to TM and not the ground the unit is hooked to?

[Larry3215]

So the ground from skeg hooked up to TM and not the ground the unit is hooked to?

They will be the same. You want to connect to the power supply ground wire where it connects inside the head. There will be a terminal block usually. That same ground wire connects to your battery negative, so they are the same electrically. No need to run all the way to the battery post when there is already a wire there.

[Treeguyus]

According to that link, all the 2013 and later Terrovas have all the grounds and chokes already built in. Im hoping I will be OK.

Rocket I have the following on my Terrova, PS-31 and a 83-200, then a HB to operate the terrova via link. No interference, keep the wires separate and strive for a good ground goes without saying typical for all my rigging.

[Carolina_Rig]

So the ground from skeg hooked up to TM and not the ground the unit is hooked to?

Yes, and they are separate. 24VDC routes up the passenger side and the terminal block is under the bow console panel. The Ground from the skeg is connected to the (-) on the terminal block. It is electrically isolated and separate from the 12VDC.
There's a separate terminal block in there for 12VDC. Graphs, front electronics, and the rest of the boat's electronics are on the 12VDC side. This is my boat's setup. Some TM's are 36VDC. But power to the TM should be a separate system from the 12VDC powering everything else.
You may want to also separate the wires under the front console as much as possible to further reduce noise.

[C Parker]

So I have a 36v trolling motor that was using the cranking battery for trolling also. I added a 4th battery so I could dedicate the cranking battery for electronics and cranking. Now I have the TM on its own batteries and they are run on the opposite side of boat. After installing ground on skeg do I run it to the head of TM...I have it ran to the block in the bow where the electronics are terminated which I think is incorrect.

Also doing it like this takes the on board charger out of question.

Sorry that I'm kinda asking the same thing over again! Just want to make sure I'm doing it right before I take it off and send it to a authorized dealer.

Thanks

[Carolina_Rig]

So I have a 36v trolling motor that was using the cranking battery for trolling also. I added a 4th battery so I could dedicate the cranking battery for electronics and cranking. Now I have the TM on its own batteries and they are run on the opposite side of boat. After installing ground on skeg do I run it to the head of TM...I have it ran to the block in the bow where the electronics are terminated which I think is incorrect.

Also doing it like this takes the on board charger out of question.

Sorry that I'm kinda asking the same thing over again! Just want to make sure I'm doing it right before I take it off and send it to a authorized dealer.

Thanks

You want to run the ground wire from the skeg to the ground (-) on the 36V TM power supply; not to the ground on the 12V power supply.

[C Parker]

Thanks.

[Carolina_Rig]

Anytime bro. Hope you get the issue resolved.

[C Parker]

Well adding a battery and connecting that ground helped a lot but still a good bit of interfernce left. Do y'all think adding that internal ground will help? I think they call it shunting the ground or something like that?

[Carolina_Rig]

Can you post a picture of the interference you have? So you're still seeing interference when you bump the TM?

[Larry3215]

Unfortunately, there is no telling what will work and what wont or how well it will work. It comes down to trial and error and keeping your fingers crossed.

[C Parker]

Ive never tried to post a pic but will try. Yes it's not as bad when in shallow water but it's still pretty bad at 20' and deeper.

I havent even taken my panoptics out of the box because I figure it may be worse. This is really aggravating because the panoptics is the only reason I got the Garmin.

[TeeDee]

It will be worse in deeper water. Mine is almost non-existent in water < 8'. Progressively increases until about 15 and then is very noticable deeper than that. I ran my unit from April until October and never noticed a problem, but I was fishing a shallow lake. When I moved to a deeper one it was there. Prob was there the whole time just not observed. I have tried attaching my cable to the shaft via velcro and getting the cable about an eighth inch separated from shaft. Thinking of trying a plastic sleeve next. When all is said and done I will have to decide whether I want to just accept it, or install stick for a separate mount. Larry has shown pics of his application. Ho-made da-ducer if you will. As Lenny said the batt saver and variable speed dealies are the main culprits. SV and Dv freqs are enough different that they should not be effected.