some things that may help the hum
I have cannon elect. I don’t have a lot of hum
and you need this Insulator between the ball and cable.
have not found any in stores around here
have seen the scotty snubber in stores
CANNON DOWNRIGGER PART 2200148 - SNAP AND INSULATOR
http://www.fish307.com/…-snap-and-insulator/
Scotty Downrigger Weight Snubber with Swivel and Snap
this is what it looks like
https://www.walmart.com/…053509&wl13=&veh=sem
Downrigger-weight-snubbers
http://www.kokaneefishingforum.com/…showthread.php?1704-
I love downriggers and catch a lot more fish with them
last time I was at Strawberry I had the downriggers down 15’
here is how I do a check to see if my boat is “hot”. When on the water I will put riggers down about ten feet.Then I will turn on every electrical device I have on the boat. Then I will slowly let the trolling motor push the boat through the water.I will then hook the positive side of my voltmeter to one of the downrigger wires.
Then connect the neg side of the meter to the neg on the battery.Then I will check the voltage. Now be sure that you have a meter that will read 0-1.0 volts..If memory serves me,I think the ideal zone is around 0.65-0.75 volts.If you have a higher voltage,you could have a “hot boat” The book says that if it is hot to turn off each electrical system (vhf,stereo,bilge pump,etc) one at a time,til the voltage drops into the required zone.
When you have identified the system that is causing the boat to be “hot” then start checking for loose grounds,bare wires.etc. If the boat checks out good on one downrigger,then I will hook up the other one ,and preform the same test.If you have a chance to get a copy of the book,“downrigger fishing techniques”,from pro-troll they have some great info when dealing with a "hot "boat.I think that it is important for those of us that have electric downriggers,with stainless steel line,and aluminum boats to a least make a voltage check every once in awhile.
Very good information,and that is how I check my voltage. for those of you with a glass hull ,this might not be as big of a problem. Those of us who own metal boats, should be checking for a hot boat a couple times a year. Humming is caused by speed of the cable through the water. If it wasn’t speed it would hum all the time.
Personally I don’t think a cable humming affects fish all that much. now there be times when it might,but if your not catching fish when the d/r cable is humming,it might be from trolling to fast.