Hi and thanks for using 2CarPros. Com.
That is actually a scary story. Thank goodness nothing started burning while you were asleep.
Regardless, when you saw the smoke, did it have an electrical smell or was the engine over heating?
As far as the starter solenoid, it is located on the starter. I have attached a picture of how it is located on the starter. The starter itself is on the front side of the engine about the same height as where the oil pan attaches to the engine block. Here is a link that discusses a starter and how it works. It has several pictures which you may find beneficial.
Let me know if this helps.
Take care,
Joe
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Sunday, October 28th, 2018 AT 8:18 PM