Ok, so I've connected a vmax battery to a blue sea 100A fuse block. Positive side of battery goes to a battery switch, then a 100A fuse, then to the fuse block. Negative side of battery goes to vehicle chassis. As does the negative side of fuse block. There is only one thing wired to it: a maxair fan deluxe. Max draw: 12.5A. Currently popping 15 and 20 amp fuses when battery switch is turned on. Have tried attaching fuse block to negative side of battery, same result. Put fuse before switch, same result. Wires from battery to fuse box are 4AWG on pos and negative. Ground wire to chassis is 2AWG. not sure why I keep blowing fuses, could use some help please!