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I have a hds9 gen 2 touch and a motor guide tour digital trolling motor. I have bad interference when motor is on. The screen will almost turn solid white. I looked at a YouTube video where a guy hooked a wire to the hose clamp on transducer and ran it to a solid negative side of his trolling motor plug in the boat. Would this be the best way to fix this problem?
Thanks
It may or may not work. Here is some reading for you. http://www.crappie.com/crappie/fishi...-interference/
Couple of questions.
1: Is this a bow mount fish finder?
2: Are you pulling power from the same battery that is being used by your trolling motor?
3: Do you have a transducer built in to your trolling motor or one that is mounted to the trolling motor?
Reason I ask is that your interference might not be what you think it is. It could be RF interference (radio Interference). You get this when you have electronics operating on similar radio frequencies in a confined area. I've even seen it from boat to boat. What you see on the screen might not be from the transducer when you turn the TM on, but rather RF interference because you turned the TM on.
I also ask the questions because I'm sure there is going to be a lot more people with way more knowledge and experience in this matter chime in.
It is bow mount. I run bow and console unit off of cranking battery. No transducer in motor.
I have seen people with just a small amount of interference enough to fish with. Mine goes almost solid white screen. I saw another thread about an inboard charger and unhooking the cranking battery and try it.
Tie the negative of the cranker battery to the most negative post of the TM battery if you haven't done so.
You can turn you tm speed to max and see if at max power if the noise disappears. If it does, then it is prolly the noise from the PWM module.
So hook cable to the negative of one troll battery to a negative of the crank battery?
Use the most negative post ( the one with the wire going to the trolling motor). Usually a black ins wire.
Some folks recommend this wire have 3a fuse in line fuse between battery negatives.
This connection generates a common point ground between the battery systems.
You have a tin boat? Tin complicates things.
It's a glass boat. But I have a 24v system on a nitro and in the back of the boat you hook each battery up seperate on a block
12 24 or 36volts is what the block says on it. Would it matter what battery to hook it to?
Yes. You must use the most negative point in the series of batteries.Quote:
Originally Posted by shawnh
So you think it would be better to come off of the block on the negative side and them to the crank negative?
So to be so much trouble.
I would guess it would be the negative associated with the 12v battery. I am not sure, so ask someone who would know for sure, then hook up a common ground and see if it reduces the noise.
Thanks for all your help.
There are a bunch of steps you can take. I have done everything from a- z and got mine useable. I grounded my trolling motor to the neg side of the starting battery.I unhooked my battery charger from the starting battery and it helped quite a bit. Added ferrite chokes on the transducer and that also helped. With doing all of that mine is still not cleared up all of the way. I did figure out that if I unhook my transducer from the trolling motor and move it away that is the only way mine totally clears up. So now its down to pretty much buying a new transducer. I have also read where guys are having problem with the older trolling motors and the SI. I have an older TM
Call the TM company and ask them. There is no one thing that fixes everybody's problem. Minn-Kota installed a internal ground on my saltwater riptide to fix that problem after I tried all the other above mentioned stuff. The same thing just fixed a friends of mine. Each boat is different. That's where I would start and don't let them tell you that they are not aware of this problem. You can also call Lowrance and see what they say, they are very helpful.
I unhooked the on board charger from crank battery and that took a lot of it out. Still have a little interference but can now see the screen.