Looks like it's a 1994 Tool express:
https://www.vintagegolfcartparts.com...ar-Vin.PDF.pdf
I haven't been able to find your manual though.
Solenoids are pretty easy to trouble shoot.
(1) when not powered they should be disengaged
(2) two top posts should be infinite resistance
(3) when power is applied to the signal side, there should be a slight "click"
(4) top posts should have continuity
If there is continuity when not powered (2), the core is stuck in the "on" position. Solenoid needs replacing.
If there is no continuity when powered (4), then the internal contactor is bad and the solenoid needs to be replaced.