EZ wiring tail light circuitm

As mentioned the lights are grounded through the vehicles body. When I installed my EZ harness, I ran a separate ground wire. Like mentioned above, supply your own grounds. If I recall I created 3 main ground points in my car. I soldered a ground wire to the outside of the light socket and ran it through the grommet back into the car. Worked out great.

To test the wiring either mount the tail lights or have someone help you push the brake pedal as you ground the light yourself with your own home made ground.