Yes, however you may want to pop the cover off the LED signal box to see if it is fuse protected internally, thats if you didnt just blow a fuse box fuse. Also im not certain what you were doing exactly, changing signals, just removing the mirrors for work being done, but if you were changing signals altogether the LED box may not work with incandescent bulbs, you may have to use the wiring going to the flash box, not from it for your signal power if possible. I do not own a muscle, but I have alot of experience with those mirrors and LEDs in general.