Posted By: Rayzor
Trolling Motor/Graph Interference - 05/16/21 12:40 AM
I replaced a 7" Lowrance Elite on my 36 volt Motorguide with a Humminbird 9" Helix. The Lowrance worked great for years but developed a "dead spot" in the graphics. I never had a problem with the Lowrance and TM interference. Took the boat out today for the first time with the 9" Humminbird up front. Right after I stepped on the Hot Foot, the screen went haywire. The depth line jumped from 4 feet to way over 40 feet. As soon as I took my foot off of the Hot Foot, the graph line "fell" back to normal. It does not seem to do this on higher TM speeds for some reason.
There is no difference in the install of the older Lowrance's and the newer Humminbird. I used the same power source and stored the excess transducer cable under the front console cover, just like before. I took the new transducer off of the TM, stuck the TM in the water, held the transducer in the water, and stepped on the Hot Foot. Same interference.
I can move the excess transducer cable a little bit, but I do not know what else to do. The TM plug wiring is also underneath the front console cover, which is where my power source for my Humminbird is.
I have had numerous trolling motors with transducers mounted in them. This is the 1st time I have ever had any problem. Any input would be welcome.
There is no difference in the install of the older Lowrance's and the newer Humminbird. I used the same power source and stored the excess transducer cable under the front console cover, just like before. I took the new transducer off of the TM, stuck the TM in the water, held the transducer in the water, and stepped on the Hot Foot. Same interference.
I can move the excess transducer cable a little bit, but I do not know what else to do. The TM plug wiring is also underneath the front console cover, which is where my power source for my Humminbird is.
I have had numerous trolling motors with transducers mounted in them. This is the 1st time I have ever had any problem. Any input would be welcome.