Vehicle wiring.

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Been working on fixing up a trailer. After wiring the lights, went to check them, and realized my grandads lights aint working. There is some sort of block between the wires coming off the vehicle, and those going to the trailer.I can identify all but one of those cords going into the box, although i think it is going to a battery connection.Double checking if I should just cut out the box and connect directly or not, or if that is a terrible idea. Any help would be great.The box (I think its a wire harness) is cracked down its center, thats why i think maybe thats broken. via /r/DIY https://ift.tt/3njbey4

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