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Thanks for using Just Answer, sorry I didn't see the optional info. Anyways, the starter solenoid is located on top of the starter, actually part of the entire starter assembly. I am sending some diagrams pointing out location, hope this helps you out. Thanks.
When the ignition switch is turned to the START position the starter relay switches power to the starter solenoid causing the starter motor to engage as long as:
WARNING: When repairing starter motor or performing any maintenance in the area of the starter motor, note the heavy gauge input lead connected to the starter solenoid is hot at all times. Make sure the protective cap is installed over the terminal and is replaced after repair.
1. Disconnect the battery ground cable.
2. Remove the ground strap bolt.