Hi,
There could be an issue with the battery. What I suggest is this. Have it charged and load tested at the parts store. They most likely will do it for free.
Now, since the vehicle sat for a long time, there is a good chance that mice or other animals may have damaged wiring. Tell me. When you connect the battery, how quickly does it die? Also, do the battery terminals get hot? If something is drawing that much power, the cables should be extremely hot to the touch.
Next, have you checked to make sure grounds are clean and tight. There is a main ground between the battery and the engine block that can be corroded causing the starter to not function properly.
Let me know as much as you can. Also, let me know if you are still able to start the vehicle.
Joe
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Sunday, April 12th, 2020 AT 8:42 PM