Fish finder frustrating

[westmdbass21502]

Ok I think I’m having interference on Garmin striker 7 sv..called Garmin and no help there ,I did put on ferrells and no help,moved the transducer with new bracket which keeps it off motor head and no help there now the weird thing is it doesn’t do it all the time,but when it does it spikes soon as I hit switch and stays on when I am using to go long distance .Any body else have problems is it transducer or trolling motor and forgot to mention I did a ground still spikes

[Scott F]

Are you using the same battery to power the depth finder as your trolling motor?

[westmdbass21502]

No separate battery

[Jig Man]

The best thing I have found for interference is a ferrite choke mounted in the trolling motor power cord.

[westmdbass21502]

Well I do have ferrite choke on the power wire,but to ya put it close to fishfinder or anywhere on wire

[LonnieP]

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[Tennessee Boy]

If you are using an onboard charger,  try disconnecting it from the battery your fish finder is attached to.  I’ve heard of interference leaking through the charger from the trolling motor.  I think this is rare but it’s easy to test in the garage.

[westmdbass21502]

Ok will try it...thanks

[Jig Man]

Do you have a ferrite cloak or one of the rings?

[westmdbass21502]

On 7/26/2019 at 4:08 PM, Jig Man said:

Do you have a ferrite cloak or one of the rings?

Choke

[Jig Man]

56 minutes ago, westmdbass21502 said:

Choke

How is it installed?

[westmdbass21502]

It’s snapped on close to the finder on the power cord