Downrigger voltage

[Strike Zone]

I'm not sure how to raise the voltage that my boat puts out? It read .42 volts when the ball was at 70 feet deep. I measured from the dr. wire to the aluminum gunnel on the boat. Also from the dr. wire to the ground cable on the battery. The boat is all aluminum. I had all electrical circutits on the boat turned on and shut them off one at a time, The voltage stayed the same no matter what. I also cleaned the zincs on the motor. The boat doesn't have any zincs on it. Any suggestions on how to raise the voltage up a bit to .65 or so? Thank you.
Strike Zone

 

[dragonfly]

most people would give anything for voltage that low but if you want to jack your voltage up I use a pro troll to check and adjust my voltage on my scottys, my cannons has it built in.dfly