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This looks like a wiring fault since almost everything indicates a short or low voltage.
Did you take a glance through the engine bay to see if there were any wires that looked out of place, maybe chewed up by some rodents or animals? Before purchasing any parts I’d go around and check that each one of your components is getting sufficient power in and ground with a simple circuit light tester. I suspect this will give you an idea as to where to start.
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