Starter motor

Starter motor plunger closes and motor is supplied with battery power, which in turn cranks engine, when "S" terminal is supplied with electric power.

Courtesy of NISSAN NORTH AMERICA, INC.

• "B" terminal: "B" terminal is constantly supplied with battery power.
• "S" terminal: Starter motor magnetic switch ("S" terminal) is supplied with power when the cranking condition is satisfied.