My engine light will come on and then blink 3 times go off and blink 3 times... This is on a 2005 Royal Star Tour Deluxe. Any idea??

SOURCE: 1997 Royal Star Tour Deluxe

your switch has gotten water in it, under the tumblers the connecters have been arking & caroading causing it to loose connection

SOURCE: How do I add coolant to my 2005 Yamaha Royal Star

remove radiator cap slowly pour in 50/50 mixture while burping radiator hose. Better to do while running if possible

SOURCE: how do I check the oil level on a 2005 yamaha

What would happen if I need to get more roaring & louder sound from my original stock exhausts by drilling 1 hole in each exhaust end

SOURCE: where is the fuse box?

http://home.centurytel.net/malizia/RS/Manual/CH08-Electrical.pdf Go to this site and look for it.

SOURCE: Is there a way to hook up 4 way/emergency flashers

Not without seriously compromising the wiring harness and exposing wires to excessive corrosion. The turn indicator circuit starts at the signal fuse, voltage goes from the fuse to the flasher relay, through the relay to the turn indicator switch. The switch has a single input (voltage from the flasher) that may be routed by the switch one of two directions - the two left turn indicator lights OR the two right turn indicator lights, There is no position that routes voltage to both sets of lights, nor is there a provision in either the switch OR the wiring harness for one to be created. Police motorcycles have special wiring harnesses that intercept the leads between the switch and the lights, diode-protecting the turn indicator switch from voltages generated by a separate light control box, used to power flashing lights added during the assembly of the motorcycle, or by qualified installers during its conversion for police use.