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Okay I am going to drill a hole in my skeg and run a ground to see if it cleans up my interference issues. Can I tie to the ground wire inside of the motor head or does it have to go back to the battery? Also, why does the ground wire under water not cause electrical shorts? I was always taught that electricity and water did not mix?
If you are grounding the trolling motor’s motor housing, I would run a wire all the way back to the battery, unless I confirmed through VOM meter testing that a good connection exists. With the wire you know that you have a good connection between the two.
Water and most water doesn’t mix (I’ve read where deionized water will not conduct electricity but I sure don’t want to be the one to test it!) but your boat should be running with +12 volt system to power the main motor and gauges as well as the trolling motor (or 24/36 volt for some) and all of these should use a zero volt ground. All you are doing is making sure that the ground of the motor housing is at the same level as the ground for the rest of the boat. This will help shunt the RFI to ground.
Thanks