I am modifying my daughters ATV and wanted to add police type lights. I found this circuit which is perfect for my cause.
Project - http://www.electronic-circuits-diagrams.com/lightsimages/lightsckt11.shtml
This is the first electronics circuit I have ever attempted to build so I built it first on a test breadboard. I am running 12 volts instead of 6 or 9 but I did buy the relays to match the voltage. The problem is when I first hook up the battery the D2 diode lights up for about 1 second, after that the D1 diode flashes about as I would expect it to but the D2 diode never lights again. I am seeing jumpy voltage across pin 4 on the D2 IC 555 chip but there is no voltage on pin 3.
While I was measuring voltage I put my meter on the pin 2 side of the 68k resistor and the other side of my meter to ground. This actually caused the D2 diode to flash.
I'm not sure where to go from here, and my knowledge when it comes to electronics is minimal at best.
Any suggestions would be appreciated,