losing bottom

[jack1]

I have Garmin 250 fishfinder that had been working fine. Recently when running at anything above slow speed it loses bottom. I've cleaned the transom mounted transducer and the hull area around it. Nothing seems to help.

 

[rickdb1boat]

Re: losing bottom

Is the transducer locked in to the mount and is it pointing straight down?

 

[jack1]

Re: losing bottom

Rick- As far as I can tell. The boat is kept in the water but I'm going to check it again. Thanks

 

[kmurray802]

Re: losing bottom

It's most likely a "secure mount" issue unless something is causing turbulence(air) prior to transducer.air in water will screw it up.You might try switching frequency's & playing with the range to see if you can improve sounder performance.

It's recommended that transducer cable not be ran in direct contact with other electrical wiring,but I don't know what kind of interference would be caused if any.(I've ran them tie-wrapped to battery cables before and not really seen any problems).But it might be something to check.I guess if your alternator was increasing output when you throttled up that may be a possible scenario?

Good luck.

 

[64NHALF]

Re: losing bottom

I have Garmin 250 fishfinder that had been working fine. Recently when running at anything above slow speed it loses bottom. I've cleaned the transom mounted transducer and the hull area around it. Nothing seems to help.

I was having the same problem with my humming bird, any time I went above a low troll, I would be in 300+' of water in a 15' lake, so I took one of my old motorcycle batteries and hooked it upto my depth/fish finder, and presto* all was good, I could run at high speeds and still read bottom. Plus the cycle battery had plenty of juice to run it all day.