Robust switch and construction make emergency flasher rugged enough for off road vehicle. Two PNP transistors are 2N2870. Two NPN transistors 2N2270. Two 25 uf capacitors are 25 volt electronic ( about 2 year service life). Adjust 25 uf capacitor and 27 k ohm on both sides to set flash rate. 27 k resistors are 1 watt, 1 k resistors are 2 watt, 150 ohm resistors are 1 watt.
Switch upper left power switch on/off to get lights going, if needed.
Keep flash rate under 5 times a second.
Blue clearance lights of .6 amps can be used or 1156 lamps at 1.7 amps.
