Access the forklift's engine compartment and remove the negative and positive battery cables with a wrench.
Loosen the ignition mounting bolt to free the ignition switch from the back of the dash panel.
Disconnect the old ignition switch's plastic wiring harness. Plug the new switch into the wiring harness.
Re-mount the ignition switch onto the back panel and replace the mounting bolt.
Replace both battery cables with the wrench then test the forklift's new ignition switch.