Ripster uprated Safety Brake Test switch. This is a dielectric switch, which works off pressure in the brakes system. If the brakes are NOT working correctly, the circuit does not connect and thus the buggy will not start. To test switch (by a competant mechanic), connect the two wires together (on the back of the switch - to by pass it) and if the buggy starts this means you have an issue with the brakes, and thus the pads and cylinders need to be checked for correct operation.