You going to have polarity regardless of the depth- it is natural with dissimiliar metals on the boat. The polarity works for or against you from the electrical current(s) from the boat.

There are some folks that use parachute cord between the snap and the ball. However, you will not need to use parachute cord if the ball is cast iron or coated. Breaking connectivity should be the first order of business, Use a plastic snap if you are using lead balls. A lead ball is going to add current to your wires if you are running straight to the wire with a stainless snap.

The second thing you'll want to do is Fluke your boat. Drop the ball down a few feet in the wire and check the current. Ideally, you're running between .7 and .9 volt naturally. A step by step check can be found at SCOTTYUSA.com.

Recommended currents for Kings is .600V. However, I am running roughly .680 to .700 for 140' to 170'. Pulse mode shoots me up to .750 (natural polarity). On a slow morning, switching to pulse will usually put onto a fish.

Downriggin'
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"If you are not scratchin bottom, you ain't fishing deep enough!" -DR

Puget Sound Anglers, Gig Harbor Chapter