you could also just use one of the stock connectors to make it easier. also I forgot to label the fuse on that drawing

here ya go



yeah just get some bosch 30a automotive relays, should be like $2-$5 each. I'd buy them off of ebay, you should be able to get them for $1 each on ebay. 4 pole or 5 pole doesn't matter since you wouldn't be using the 5th pole.