Outer Limits 4x4 Board

i keep blowing my glow plug fuse, i put a bigger amp fuse in and it went aswell.

this morning it melted a aligater clip so some thing is really wrong. i'm crap with the sparky side of cars but if anyone has an idea on where to start looking please let me know. i only had time to check the wire to the plugs this morning and its nice and clean and isn't lose.

Something has earthed out try looking at the rail on your inlet manifold that geas to the top of your glow plugs it should only be conected to the tops of the plugs and the wire that feeds it the rest shouldn't be touching anywhere als trace that wire back for where it may be grounded