older gator 6x4 with kawasaki fd620d engine wont start

I have an older gator 6x4 5/95 with the kawasaki fd620d engine. I hear the motor spinning on the starter but the solenoid doesnt kick the gears in. I have checked connnections for days. I put a new solenoid on. It still has the same problem. Most think it is not the red fusible links. I have just a red pos. Wire on the starter solenoid. I only have the black (neg.) grounded to engine. I dont want to spend lots of money to fix it. Voltage Regs.are exp. Along with CDIs etc. I am disabled and cant walk to my hunting blind. There obviously is power to the starter. Any troubleshooting comments would be deeply appreciated.

Thanks

Tom Megna