Simple Power Mode Example

The power mode signal may be as simple as a battery positive voltage input wired to a particular ignition switch contact. If this is also the battery positive voltage supply to the module/device, the module/device will only operate with the ignition contact closed to battery positive voltage. An example of this is the starter relay when it is wired directly to the CRANK/START contact of the ignition switch. When the CRANK/START contacts are closed, the starter relay is energized and provides a current source to the starter and starter solenoid. When the ignition switch leaves the CRANK/START position, the switch contacts open and the starter relay is de-energized. This removes the current source from the starter and solenoid and the starter operation stops.