General location of the fuse box. In most Ford F150 models, the fuse box’s general location is either inside the truck near the steering column, beneath the dashboard, or under the hood in a black box that is labeled. It houses several types of fuses, each responsible for a different part of the F150’s electrical system. So finally- the difficult bit- finding the cause of the blowing fuse. A fuse is there to protect the circuit against excess current- measured in Amps. A cars electrical system is 12V and the formula is W=V x A, where W is the Watts in the circuit. Therefore a 10A fuse in a 12V system should have a maximum load of 120W. tBuyJrx.