The starter RELAY is the little box on the firewall of most Mopars.
The starter SOLENOID is on the starter.
That's a solenoid because it drives motion, in this case the starter pinion's injection into the flywheel's ring gear.
The relay tells it to get to work.
I was wondering when someone was going to clarify all that !!
The relay uses low current to trigger it, protecting starter switch. That's the thin wire to the relay.
When its triggered, the relay sends higher current to the solenoid. That's the two heavy wires on the relay - one from the battery and one to the solenoid.
The current from the relay fires the solenoid which sends FULL battery current to the starter. That's the heavy wire from the battery direct to the starter.
