The Ron Francis Low Voltage Sensor fixes a common issue when using a one wire alternator. The one wire alternator doesn't have a connection to the "idiot" light to monitor the voltage, and this sensor fixes that issue. This sensor installs to a primary 12 Volt source, a ground, and an indicator light. It will send out a signal to the warning light if the voltage drops below 11 Volts. Combine this low voltage sensor with a Ron Francis Indicator Light for instant low voltage alerts.