Electrical Issues

[Nizzan4u2nv]

After replacing my water pump last saturday, I test drive it and all of a sudden the car shuts off, but outside lights/hazards/guages still work, nothing else in the car will. I pull into a parking lot and see that the 30AMP IGN fuse is blown so I take the only other one(rad fan) and put it in, everything turns on, I start the car, then it blows again. So we move the car out of the way and try and see if anything is shorting anywhere, no dice. We have no more fuses so we try and jump the posts where the fuse is, it kinda starts. We finally get it to start perfectly with the screwdriver jumping the fuse posts. So we go home and get another fuse from another car. Drive it home, and its fine. But now, everytime I hit a bump, it shuts off for a split second. It almost shut off completely, and the CEL was flicker for a bit, I downshifted then it was fine. Any ideas? Possibly the bad motor mounts somehow cause the starter to short from loose wires? The car sometimes has a problem starting. You have to turn the key from off to on then off to on inorder for the starter to move. You can kinda hear a little hum sound when it doesnt start, but its been doing that since I bought it. Any suggestions or thoughts? Its really starting to stress me out.