Abstract: An auxiliary vehicle lamp operation system that detects interruption of DC current flow by a PIC microprocessor, which is Hall Effect device, based upon a decrease in the magnetic flow to a failing dim headlight bulb which, then, activates a power width modulation transistor which, in turn, activates an N channel power MOSFET, through which the microprocessor pulses the output thereof at approximately a 50% duty cycle to the bright headlamp bulb, permitting illumination output of the bright headlamp approximately the same as normal output of the dim headlight bulb. Upon detection of the failing dim headlight bulb, a visual indicator is provided by at least 3 one-quarter second flashes of the dim headlight bulb. Activation of the bright headlamp switch provides a normal rate of current to the bright headlamp bulb regardless of the detection of interruption of the magnetic field of current flow to the dim headlight bulb.