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the diode or where it belong?

There is a R32 VW Golf with custom plates that haunts Logan rd near mt gravatt south brisbane I see a bit. It's almost immoral! golf is the most common i seen in logan/south brissy in black, red and silver(one with radar strapped to the back of it on compton rd). silver lancer evo's (got pulled by ...

does anyone know about the little black diode plugin and taped to wiring harness near the battery??:confused: what does it do?? i pulled it out and pluged a small fan into it and now the car is not running smoothly anymore, any ideas, any help will be great as i have no idea what i might have screwe...