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There are a couple of wires on the solenoid. The big heavy wire, a cable, goes to the battery's positive terminal (on almost all vehicles still on the road). The smaller wire is the "actuation" wire, and it has to tie into the ignition key somehow. There should be "12 volts" on the big heavy contact to the solenoid 'cause the cable goes directly to the battery. When you hit the key (turn it to "Start"), the "12 volts" should then appear on the "small" wire to energize the solenoid, which will then close the big contacts and energize the starter motor. Remember that the solenoid is a big, high current switch, and it has to shut to apply the battery voltage to the starter motor. Lots of amps flow when the starter is energized, and the cable and the contacts handle all that current. And the solenoid, besides being a high current switch, is an electrically operated one. The key powers up the solenoid, which then closes the big high current contact set. It is far from practical to have the ignition key directly close the high current path from the battery to the starter. No vehicles do this. The solenoid and starter are grounded to the engine block, and this provides a return path to the battery for the high current flowing through the starter when it is energized, and also for the low current flowing through the solenoid when it is operating. Hope this helps. Good luck.
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