i got an 89 F250 and i put LED replacement bulbs in the flashers and tail lights and now the blinkers only work when my parking lights are off and if they are on they dont blink the light just stays on in the cab any suggestions would be awesome....
thanks
nick

 

Most of the time, you cannot replace the lights with LED's without using load resistors on the lights and or also using a electronic flasher. If you can re-install the old lights and it works fine, then that's the problem. The original flasher works on bulb load, and the LED's don't have enough load to make the flasher work.

 

so is there a way to change the load? or am i just gonna have to get the flasher solenoids?

 

Here's a link for some resistors. Do some searching on the subject on the web and you will get the jist of what I am talking about.

LED Load Resistors