Hi,
The idea that nothing works indicates total loss of power. The ABS wouldn't have caused that.
First, make sure the battery terminals are clean and tight. Also, since the vehicle was sitting for several months, open the hood and confirm none of the wires around the battery have been damaged by mice or other animals.
https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked
If everything appears good and the terminals are clean and tight, it's unlikely, but something in the battery could have shorted. So I need you to check for power from the battery using a multimeter or a voltmeter. Here is a link that explains how it's done:
https://www.2carpros.com/articles/how-to-use-a-voltmeter
Let me know what you find.
Joe
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Tuesday, October 27th, 2020 AT 2:18 PM