this might help
http://www.sportsmanshow.net/Articles/article5.htm
i would tend to disagree with the .6v for spings, really it depends on finding the sweet spot for the boat you are running. for instance, i had my last boat running .63-.65v and couldnt touch a spring for my life!, i switched the scotty plastic lead clips for metal ones which dropped the voltage to .48, didnt get skunded after that (on springs) coho or pinks i had no problem even with the higher voltage. on the same note i have a friend running .7v on his boat and it is one of the hottest spring boats on the south coast, different boats like different voltages
now.... if you put a non-conducting line on your downriggers you will only be releying on the sight-bite relfex instead of using your downriggers to bring the fish to you
i would recomend fishing one dr with a metal clip and one with a plastic clip. you will find that one of them will catch fish more consistantly than the other no matter the gear hooked up to it or even throw a gangon line between the lead and the clip this will also change the voltage. once you have figured out what they want, switch all the dr's to the same set up and youll be laughing all the way to the derby wiegh scales. :wink: 8)
oh yeah, i have run the scotty black boxes and would now consider them a waste of $$. i think its much better to get the boat to fish properly without one. and for you guys that do run the black boxes try unplugging them and quickly tap the connectors together ( drives the coho, pinks and sox nuts, lol :wink: )