I need some tail light wiring help, please....

[lowroder]

So I finally got to install my new tail light buckets. With new ground wires attached an to frame rails.
Connected my new harness for taillights.
So I was curious to see how the taillights would be .
Yet still having to install the harness to the firewall.
So I plugged in the new taillights harness to existing factory harness.
An I have good bright running an brake.
But now my signals flash like hazards.