Originally Posted by drummerboy
The flasher relay is the cheapest test fix. Diode Dynamics makes one that I haven't had problems with after 3 years so far, and its customizable too (number of tap-to-turn blinks, hazard blink pattern, lock/unlock light timer etc.)
I agree... When you're messing with aftermarket lighting, it's always a toss-up when it comes to what is wrong - but a flasher relay is relatively cheap, and pretty easy to replace. I also recommend the Diode Dynamics.
The only other thing to check - assuming you've already checked the fuses (though the clicking relay should rule that out), is going back to stock lighting.