The starter solenoid is built onto the starter itself. It is a dual action solenoid applying energy (12 volts) to both the starter and the Bendix. There is also a starter relay located on the fender well just beneath the left hood henge. In addition to this, will be a manual type switch controlled by a push-rod from the ignition key switch. this unit is located on the steering column under the dash and applies energy to the start relay, which energizes the starter solenoid, Bendix and the starter itself.