I admit it, it was me....I want to soften the blow in my mind that I would do something like this so I will qualify it by saying it was dark. Yes I could have taken the time to get a light but I didn't. The spark and then the horn sounding off was the the clue I needed but the damage was done. The car would not recognize my key and after playing around of course I was able to start the motor but all the dash warning lights were flashing and warnings were coming up about oil pressure and the like so... I spent a minute under the hood and found the fusible link had one of the fuses blown so I crossed my fingers, ordered a new one and installed it. The key is still not recognized but the motor did start up and the doors unlocked, I was also able to put the car in gear and move forwards and back. Most is not all of the dummy lights were on and I got various warnings about the engine not performing properly so I shut it down fairly quickly and decided to do some research. The best I have found so far is some pretty detailed information on this site about the same issue on a Gen 3 Prius. I usually work about 10days in a row and then have 4 or 5 off and I am just back to work now for another 10 day stent. I figure at the least there are some other fuses and/or relays that have blown. Of course I am hoping for that and not the heart of the beast. Can anyone shed some light on the Gen 4, mine is a 2016 and has a lot of miles on it but I really am not ready to retire it. How could anyone do such a thing is what I might say if it was not me who did it. I humbly ask for information from anyone that might be able to help me. Thank you!