The easiest solution is to spend
money on a new course computer. The cheapest solution is to interface the output of the 100 course computer to an interposing "H bridge" rated for 30Amps......the course computer output is a PWM pulse width modulated voltage that will drive the H bridge in the corresponding direction at low
current output of the computer and with sufficient
current drive capacity to
power the linear drive.......did this a couple years ago when I converted from
wheel steering to hydraulic linear actuator without replacing the computer.