Originally Posted by somewhereinusa
The upper post in that picture looks like a ground to me. That would definitely spark if it is. The terminal you want is the big one with the red cables and a small one.
It looks like your starter solenoid is similar to this one. Jump between the big and small terminals at the left of in this. picture.
Jumping those 2 large terminals is doing nothing but throwing sparks. The lug towards the bottom of your pic is the positive lug for the starter. The lug towards the top of your pic is a ground lug. Your essentially short circuiting the battery terminals this way, so stop doing that.
That's a mitsubishi gear reduction type starter. They're used pretty widely by many different manufacturers, and as said earlier, you can jump them by using a simple wire from the large starter lug to the smaller one. They can usually be rebuilt fairly easily if one is so inclined.
As far as blowing the fuse, you'll have to look and see what it all powers, a wiring diagram would be a big help, but whatever it powers, there's shorting so look for chafed or bare wires on the circuit.