I am nearing completion on my 818 that I purchased partially completed from another builder. It uses a 2004 donor but has an Iwire electric harness. When I turn on the parking lights everything works fine but when turning the switch on for the headlights the headlights work fine but the fuse for the parking lights/tail lights/plate light blows! Electrical has always been my weak area and this has me stumped. I've tried disconnecting various lights (and testing them independently) but still can't find the problem. Could it possibly be that the light switch itself has a short inside? any and all suggestions welcome.