An idle starter solenoid can receive a large electric current from the car battery and a small electric current from the ignition switch.
When the igenition switch is truned on, a small electric current is sent through the starter solenoid .
This cause the starter solenoid to close a pair of heavy contacts, thus relaying a large electric current through the starter motor, whcih in turn sets the engine in motion.
** Working Volt : max.15V
** Continuous Rating : 80A
** Pick up : < 8V
** Release : > 2.4V
but not enough, power being sent to the solenoid,
which means that the solenoid will only begin to push the engagement gear,
making the metallic click sound.