Originally Posted by ericg
On a charging system, you need battery voltage on the B+ terminal on the regulator to produce charging voltage. Without battery voltage applied, the regulator will not produce dc voltage. You will produce ac voltage from the stator but it will not be rectified without 12v at the B+ terminal. The fuel solenoid would drop out and the engine would stall.
charging systems the regulator does indeed need 12v applied.
Not all do! Think about some of the recoil only
engines that power some of the smaller walk behind mowers. Some of em have an electric
clutch and no battery