Hi,
When this happens, do you lose power to everything and then it returns? Also, when sitting for 3 years, is there any way water could have entered the engine?
The idea that you hear no click, but everything is working leads me to think you have a loose or corroded connection at the battery. Double check that.
Next, I attached the wiring schematic for the starting system below. I highlighted both a fuse and relay that need checked. When checking a fuse, make sure the fuse is good and confirm there is power to and from it. Also, the starter relay needs checked. Here are two links you may find helpful when doing both:
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
https://www.2carpros.com/articles/how-to-check-a-car-fuse
Also, take a look through this link. It explains how to check the starter.
https://www.2carpros.com/articles/starter-not-working-repair
If you look at the schematic below, note the wire to the S terminal is black with a white tracer. Do this. Have a helper turn the key to the start position while you check that wire for power. It should only have 12v when the key is in the start position. If it gets power and the starter does nothing, chances are it is bad.
Pics 3 and 4 show the fuse location to test and the starter relay.
Let me know what you find or if you have other questions.
Take care,
Joe
See pics below.
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Wednesday, November 17th, 2021 AT 9:16 PM