Is there a how-to-guide on electrical wiring on a 95 chevy g20 work van?

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There are some wires crossed because my fuel pump keeps running I have to remove the battery post when turning off the engine or it will drain my battery and won't be able to start. It makes the humming noise as if its broke but I replaced it new and it still makes the noise when the key is in ignition ready to start, while driving even though you cant hear it and when I come to a stop.