Input Switch (ON)-Off Momentary with red LEDThe Input Switch (ON) Off Momentary with red LED allows users to 'Jump Start' the engine if the engine battery fails, or allows auxiliary loads (e. g. VHF radio and navigation equipment) to be run from the engine battery for a limited period. This saves expensive callouts on the road and potentially dangerous situations. The switch incorporates an LED which informs you of when it is engaged disengaged.