Reply With QuoteOther folks are not too happy with this problem. We should have been informed about this crap.
Trolling motor (US2) transducer interference at IDOfishing.com
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One more little piece of info that might shed some light on what is going on inside the motor. MK says that even using the TM battery to power the depthfinder, such as in a boat with no outboard can cause this problem. This isn't just a little leakage either, as some owners have reported burned wiring and evidence of the nose cone of the motor being hot.
That seems to say that the reference for the transducer negative is tied to something that is not TM battery negative, but that it is held at a particular voltage with respect to TM negative. That could be TM battery positive, but more likely it is some in-between voltage.
What causes the problem isn't connecting the cranking battery negative and the TM battery negative, but connecting TM battery negative to the fishfinder at all.
It even happens if you use one of the TM batteries as the cranking battery for a kicker motor that doesn't share a wired path to the big outboard. It appears that having both lower units in the water provides enough current in some situations to cause problems.
Hmmm...
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Other folks are not too happy with this problem. We should have been informed about this crap.
Trolling motor (US2) transducer interference at IDOfishing.com
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The big problem IMO is that if you pop the fuse, the noise reduction built into the motor is disabled, but there is no external indication that it's happened.
This seems to have not been well thought out. If the change makes the setup work better, at the very least it should have been well publicized.
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Originally Posted by CatFan
I agree. If nothing quits working, it would be hard to tell something has malfunctioned. Anyone could have a blown fuse and not know it and all the add on choke filters to reduce noise is masking a possible blown fuse.. Maybe your TM (Catfan) friend can tell us how to test the fuse. The fuse must be internal. I don't remember seeing a fuse holder in the speed control module area.
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I am having interference issues also. I have a HDS 5 using the US2 on the trolling motor and a HDS 10 with structure scan on the console. Both of my units hae interference when the trolling motor is running. Differnet speeds show different interference. Both units are powered of the starting battery. I will check today on the fuse at the trolling motor. Trolling motor is a Terrova 80 lbs. I also use the same setup on my bass boat and have no interference.
Thanks,
Scott
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