Ancor Black 4 AWG Battery Cable - 100' [113010] Brand_Polyform U.S. Molded in flow direction indicator

Molded in flow direction indicator arrows

The HSC100 is waterproof so it can be mounted externally on steel hulled vessels

all electrical connections are sealed with liquid-tight heat shrink tubing to form an impregnable barrier against saltwater

then most likely the solenoids are bad

and tiller boats

Ancor Black 4 AWG Battery Cable - 100' [113010] Brand_Polyform U.S. Molded in flow direction indicatorBlack 4 AWG Battery Cable 100' Features: ANCOR Marine Grade wire is manufactured from tinned copper stranding for maximum protection against corrosion and electrolysis. Ultra flexible (Type 3) stranding resists fatigue due to vibration and flexing. ANCORs proprietary premium vinyl insulation stays flexible even in extreme cold and resists salt water, battery acid, oil, gasoline and ultra violet radiation. Exclusive insulation is rated at 600V, 105C