The way I had it wired is this:
power from + terminal on battery with inline fuse to relay, grounded to - terminal plugged into ballast, ballast to drivers OEM harness.. Then should have long wires to reach passenger assembly ballast to lights with a ground wire. Passenger OEM harness does not get used, tape up to cover exposed terminal.

If yours isnt hooked up that way you will get flickering and that will ruin the ballasts.