Abstract: A force-actuated electrical disconnect switch for connection between major electrical components of a vehicle and an ungrounded battery terminal of the vehicle. In an operative configuration, a pendulum in coaxial alignment with a contact shaft biases a conductor plate against a pair of power terminals which allows normal electrical power to flow to the electrical components. A severe jolt, such as a collision, with a sufficient horizontal component causes the pendulum to pivot out of alignment with the contact shaft, which is thrust downwardly such that the conductor plate breaks contact with the power terminals and immediately assumes an inoperative configuration wherein the conductor plate makes contact with a pair of grounding terminals, short-circuiting the electrical components to ground. While in the inoperative configuration, a flasher and emergency light circuit is activated. A reset mechanism is adapted to restore the apparatus to its normal, operative configuration.