Wiring a light switch to replace a dimmer switch you can replace the dimmer switch with a regular light switch only from what you have described you need to install a 3 way light switch not a single pole light switch. Then use a voltage tester to make sure that the circuit is dead.

Diva 3 Way Paddle Dimmer Light Switch Lutron Electronics
Changing light switch to dimmer switch. The black wire to the lone screw on the 3 way light switch. Well show you how to assure a safe installation. Theres more to changing a switch than connecting a few wires. The typical connections are as follows. How to change a dimmer switch to a normal switch. To replace a standard switch with a dimmer switch follow these steps.
You have to check grounding and box size for a safe first class job. Take extreme caution while working with electricity. Once the switch is secured take the faceplate and place it over the switch. Place the dimmer switch completely into the junction box and use the two included screws to secure the switch to the box. Its easy to install a dimmer switch but make sure to upgrade the wiring if necessary to make it safer and meet electrical code requirements. Use your flat head screwdriver and screw the faceplate in with the two included screws.
Turn off the power to the switch at the circuit or fuse panel. The dimmer switch is now installed and ready to go. Unscrew and remove the switch plate. If you have any doubts in any step contact a professional electrician. Unscrew the switch from the electrical box and pull it out with the wires still attached.