Radio interferance when trolling motor running

[Quastello]

my radio works fine but when running trolling motor it humms, they are connected to different batteries but wires run together to batteries, just started doing it this year, I haven't checked the antenna or put cd in while trolling to check that just lookin for any help thanks jeff

 

[Silvertip]

Separate the two sets of power wires as far as possible.

 

[dingbat]

Unhook the antenna and see if it stops. If so, you have a grounding problem. Check and clean radio and trolling motor grounds.

Could be brushes getting worn in the trolling motor as well