Battery-generator output monitor

For use with the battery-generator system of an engine having an electric cranking starter, a battery-generator output monitor, comprising:

• a. a first electric circuit including first indicator means for indicating low battery voltage during cranking, and first indicator actuator means having an electric circuit arranged for connection at a first end directly to one of the battery terminals of the battery-generator system and operable when the output voltage drops below a predetermined value during cranking to activate the first indicator means and give indication that the battery voltage drops too low during cranking,
• b. a second electric circuit including second indicator means for indicating low generator charging voltage, and second indicator actuator means having an electric circuit arranged for connection at a first end directly to said one battery terminal and operable when the output voltage drops below a predetermined value higher than the first named predetermined value to activate said second indicator means and give indication that the generator is providing insufficient voltage to charge the battery,
• c. a third electric circuit including third indicator means for indicating high generator charging voltage, and third indicator actuator means having an electric circuit arranged for connection at a first end directly to said one battery terminal and operable when the output voltage exceeds a predetermined maximum to activate said third indicator means and give indication that the generator is producing excessively high charging voltage,
• d. electric control switch means connected at one end to the second end of the electric circuits of the first, second and third indicator actuator means and arranged for connection of its opposite end directly to the other of said battery terminals, and
• e. electric switch actuator means associated with the control switch means and operable upon connection to a source of electric potential to close said control switch means and connect said first, second and third indicator actuator circuits across said battery terminals.