another wigwag headlights design

ive seen a few different DIY designs for wigwags, and being the cheapo I am, didnt want to buy parts, so I did some improv with what i had. rather different design from anything ive seen yet, kinda crazy, but its been working solid since day one. 

I used: 2pole thermal flasher, 4PDT relay, 2 half wave bridge recifiers(double diode,2leads in,1lead out, 6amp), SPST swtich. I wired all in 12 guauge wire, cause thats what i had, you can probably get away with 16 without a problem

to splice into the headlight circuts, the output side of the bridge recifier went to the headlight, one input is the factory power wire, the other imput is from the wigwag power.  this isolates the 2 headlights from each other, and isolates the wigwag circut and the factory headlight circut, avoiding backfeeding issues

now, for the wigwag circut. from switched hot lead, power goes to the 2 pole flasher, out of the 2pole flasher and to the imput side of the wigwag circut on the left headlight.  this will flash the left front headlight on and off when powered.  from the output side of the 2pole flasher i also ran a lead to the coil of the relay. so, when the headlight is powered, so is the relay. constant power from switched lead goes to the relay, such that when the relay is unpowered, it powers the right headlight.

i also use the spare poles of the relay to run a couple of alternating powered leads to the back for flashing lights back there too.

if you have questions, email, its pretty simple really

ok, here's a diag of the setup. pretty simple. fyi to those who dont know, a 2 pole flasher simply cuts power on and off.