cheap 3rd brake lite

[columbiA]

For about $20 at Walmart I picked up a combo brake-turn-tail LED lite.It was about 2" x 6" and is 12 v neg grd.On my 6v + grd car,Iused the grd wire as the hot wire & brake wire as grd wire.I centered the lite on bottom of rear window & glued it on with dab of clear silicone on each end. Simple matter to run wires behind back rest down to brake lite wire &grd.