If the harness overloads, you could damage components or even have one of those 'mysterious' Alfa fires. I'm not an electrician by trade ... but the resistors, spliced in after the fuse box, are to lower the load on the harness but to still send enough volts/amps to run the higher watt lighting system. Also, put in a higher gauge wire from the resistors to the head lights. If you know someone that is an electrician, they can run a few tests to see how much juice is running through the harness and what level of light system you want to install (this is not a big deal). Don't panic, this is just a precaution.