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Start with basics like checking the earth to the body is still sound and that everything still has insulation so there are no more shorts. Once you have verified that start checking for burned out connectors, melted wire, fried joins. Once you have done that start checking for hardwired things that still work like horns and things separate from the ecu. After that you can look at each system once you know you have power and figure things out.
Also lol at returning battery.
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