I have a 1998 Buick Regal. When the left turn signal is activated it blinks fast and no arrow shows on the dash. I thought this ment a bulb was out so I replaced the front bulb because the rear looked fine. When I did this I forgot to plug in the headlight assembly, I tested the blinker and the arrow showed on the dash. I realized what I did and pluged the assembly back in. Now the bulb, which is also my daytime running light, just stays on, does not blink. What could be the cause. Right side works fine.