I have a 2004 Mastiff. When I turn the key on, the right turn signal comes on. Sometimes riding down the road it comes on. The left turn signal works sometimes. I found a loose wire on the connector to the left pcb board. I'am learning how to use a multimeter. If i did this correctley, the pcb board is good. I have a good connection from the connector at the pcb board to the connector between the fuel tanks and from that connector to the next one under the seat. The bike has a wire plus system. Sorry I don't know what all the parts are called yet but I'am learning. I forgot but the horn and high and low head light do work. Thanks