Just got through installing Emergency Flashers on my roadstar. Cost me about $15-$18. all you need is a inline fuse holder,a 552 flasher,some wire and connectors, a few splicers and a double pole single throw toggle switch. I spliced into the blinker wires right under the seat. they work great! I ride with the Patriot Guard so this will come in handy! I mounted my toggle under my left leg on the side panel...
2003 Roadstar 1600 Silverado
Kuryakn Air Cleaner
K&N Air Filter
custom 4-way flashers
No I don't have a pic but the wires I hit were under the seat coming from the back signals I think they were green and brown, I just spliced into them and my switch is double pole single throw too were it isolates the flashers from the turn signals, if you don't when you turn the turn signal on all four will flash I think... Hope this helps