Not sure of your configuration. Do you have an SSC-32 for your brat? If so step 22 shows where to plug in the wires. If you have the PS2 configuration with the Atom Bot Board 2(BB2), then the tutorial: lynxmotion.com/images/html/build155.htm step 2 shows where to plug in the wires.
If you have both this and the Atom Bot Board 2(BB2), then follow the SSC-32 tutorial, then add additional wires from like VS2 terminal of the SSC-32 to the VS or VL power inputs of the BB2. Make sure +s go to +s…
We are making some changes to this assembly guide. It’s not as clear as it should be what’s going on. Currently Step 18 is simply telling you to install the switch to the electronics carrier using a nylon wire tie. Follow the assembly guide down farther to see where the ends of the wires get terminated.