You have a short circuit. There are a number of ways to find it. Your best chance is to retrace your steps and remove all the connections you have made, remove any new screws you have installed and verify whether that worked. If that worked then either figure where you shorted the system or start over.

The systematic way of finding the short would be to divide the system. The logical place is at the fuse but the wires there are usually made together. One could cut the circuits out one at a time till the short was removed then figure out what isn't working (of the things on that circuit) and disassemble that system looking for the short.

A more scientific way to find the short: http://www.powerprobe.com/findingshort.mov

A simple device can be built with a two prong VW flasher and a bulb. Hook one wire to each leg of the fuse creating a flashing light. Use a compass along the wire to follow the current.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician