VHF Interference help

[hanginon]

vhf has some interference when the light on my sonar is adjusted up and down. any thoughts? ground issues or what.
thanks for any input.

[hanginon]

bump

[rrrwel]

To start make sure your antenna cable to the radio is separated and is not running too close to any of your power feeds.

[thataway]

Power leads not parallel, Sonar leads not parallel Power and sonar leads separated from antenna leads. Ferrite beads on the power and transducer cables, may all help.