yep. i've had this problem with my 83 blazer where when the headlights are on, the passenger side blinker lights appear to have the brighter (blinker) element on, instead of the dimmer such that when the headlights are on, you can't see my blinker that i want to move right, except for the passenger side marker light. so i decided to check this out and opened up the wiring on the front of the truck. found nothing wrong. put it back together and it works! 
it's never worked before - i didnt do anything either - didn't move any wires really - nothing. so then i don't know what to do about the rear blinker, but i figure what the hell, i didn't do anything to fix the front, so maybe i should do nothing and it will fix the rear. so i turn the headlights on, and the blinker, go back there and give the lense three sharp taps, and the SOB starts working right. 
i like quick easy fixes. 
now people will know i want to change lanes on the freeway at nite and i don't look like such an ass. 
it's never worked before - i didnt do anything either - didn't move any wires really - nothing. so then i don't know what to do about the rear blinker, but i figure what the hell, i didn't do anything to fix the front, so maybe i should do nothing and it will fix the rear. so i turn the headlights on, and the blinker, go back there and give the lense three sharp taps, and the SOB starts working right. i like quick easy fixes. now people will know i want to change lanes on the freeway at nite and i don't look like such an ass. 
