I am fixing to start putting together my main under dash wiring harness (building it myself). Right now I have purchased 1 auxiliary fuse box with a rating of 80 amps max (plan on buying 1 other). My plans were to have one fuse box powered from the battery and one from the ignition switch. My question is this, how do you know the max amp rating the truck will put out. Can I get away with the 80 amp boxes or will they be to small.
