[joedoh]

its how you have your column wired, there are two ways to wire it and when the lights stay on constant it needs to be the other way. it has to do with the taillights, if you have a separate turn only bulb and a separate brake only bulb, you wire it one way. most GM use a combination turn/brake bulb, so it needs to be wired the other way. the instructions for your column detail this, for whatever reason I think aftermarket wiring harnesses always have it wired the wrong way for a GM out of the box.