I'm assuming your boat is 85 or older??
The 86 and later models have a wooden lower helm and just to the right of the wheel is a black lever that you pull and rotate. There is a placard mounted above the lever that instructs how it works. Its just another sleeved cables like the throttle cables that runs to the rudder arm.
I don't know what the solenoid noise could be unless the older style used a solenoid instead of cable.
The only solenoid control on my helm is for the parallel switch.
-K
1986, 32' Sedan, twin 360ci, 275hp Chrysler's w/ K&N flame arrestors