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The little black boxes are relays. You can look up what each pin is and test it out. There are typically 4 pins. When voltage at a low current is supplied across 2 of them, an electromagnetic switch is closed (typically) allowing high current to flow between the other two. So you would just need to ensure that supplying 12V to the proper two pins brings the resistance between the other 2 pins from infinite to nearly zero.
I would double check your fuses first though. Resistance across a fuse should be very low when it is not blown.
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