marker light problem

[mbchevy82]

i have two marker lights one on the side of truck and the front blinker.. if i put a bulb in the front one it makes the side one go out.. why would it do that.. the second i stick the bulb in its like it gets its power and then it doesnt work

[roger]

I've had similar turn signal problems. Check for a loose or dirty ground wire. My problem ground was above the headlight area, sort of next to the radiator. You can't miss it.