im assuming you are using a thinner wire that has the fuse perminatly attached?

if so, use a knife to puncture and open a hole big enought to accomidate the wire. then use another piece of wire (or whatever you think would work) and run it from the passenger compartment to the engine bay via the grommet. once you can reach it in the engine bay, use a lot of electrical tape to attach it to the power wire you want to run. go back to the passenger compartment and pull on the "fishing" wire. when you see the perminante wire come through the grommet, take off the tape and get rid of the fishing wire. you can then pull the rest through by hand.

:shhh: i do cocaine :/shhh: