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Fishfinder interference?

Old 11-07-2016, 07:48 AM
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Default Fishfinder interference?

When my bilge pump kicks on that evacuates water from the livewell I get interference with my fish finder. I am installing a new transducer, and would like to correct this problem. Is it a bad ground on the fishfinder (its an old raytheon unit, new one will be an NSS 12)? Or is it because the wires are traveling close to each other? Or could it be something else completely?
Old 11-07-2016, 02:14 PM
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Run the transducer cable away from other cables. If ran along with the pump cables it can induce interface. Also if pump and sounder are connected to the same fuse box the supply cable may not be big enough to supply all devices while running
Old 11-07-2016, 03:42 PM
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Bilge pump are notorious for causing interference on most fish finders. This is especially so with chirp ducers (some more than others). The best advice is as stated above, keep transducer wire path separate from other wires. On my next build I will be running separate chases fore each ducer cable to the helm.

With all that said, if your pumps are running so long that it is interfering with your fish finder use you may have bigger problems.
Old 11-07-2016, 03:48 PM
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1). Check your ground connections.

2). Make sure your electronics aren't sharing the same ground wire to the battery as your pump(s).

3). Make sure your ground wire is adequate size for the load.
Old 11-18-2016, 06:34 AM
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Thanks guys. I will make sure it is grounded separate. I think that old tube machine takes a pretty big draw. I have a new machine coming. My livewell system is not ideal, the evac pump doesn't keep up with the livewell pump and ends up sloshing into my bilge (it's below deck). The bilge pump kicks on now and then at that crucial moment and drives me nuts. My chases are pretty jammed up, but I will see if I can run it through the other chase when I put in the new transducer. I have a feeling that it's a ground/power issue though.

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