How do I make my lights flash / pulse?

Question

I attached some off-road style lights to my truck, and I rigged up a switch in the dash. I was just wondering how I can make my lights flash/pulse, kinda like a police car. Thanks!

Answer 1

Turn the switch on and off, over and over again.

Answer 2

The emergency lights on most police cars today are strobe lights.  Expensive.  The "wig wag" headlights are controlled by a special switching device; I think it's available through J C Whitney, but it may be illegal in some areas.

Answer 3

It's illegal, so don't bother.