I changed the grey five watt taillight coil out for a green ten watt coil. I grounded the green/black wire and ran the green to the taillight. I changed to a ten watt bulb.
So I put the OG coil back in. Same shit. I bypassed the headlight switch and wiring with different wires right off the wiring block. Good headlight, no taillight.
The only time the taillight comes on is when I ground the headlight coil/circuit! Somebody must have a solution!