Yes, a starter solenoid can drain a battery. When a starter solenoid is not working properly it can actually keep rotating the starter after the car's ignition is turned off. Since it requires a battery to actuate the starter, the battery will eventually be drained of power.
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starter solenoid is on the inside of the fender twards the cab from the battery follow the positive battery cable at the end will be the solenoid
Starter solenoid? Follow the + battery cable it connects to starter solenoid
You should locate and test the solenoid. Most have three connections. There is a large cable from the battery to the solenoid, from the solenoid to the starter and from the start switch to the solenoid. The power terminals to the battery and the starter are large and have large cables. The starter switch connection is much smaller. Turning the key to 'start' provides a low current voltage to the solenoid causing the solenoid relay to close and power from the battery cable to connect through to the starter. If that voltage is present then the solenoid or the wiring between the solenoid and battery or solenoid and starter is suspect. If that voltage is missing then the starter switch or solenoid feed line may have failed.
Mostly fusible link for starter solenoid is located very close to the battery or between the battery fuse and terminal.
maybe on the top of the starter Follow the+ battery cable should connect to solenoid