Help with led front turn signals.

[Drc1340]

I installed 3157 anzo led turn signals today on my 2011. I bought the 25w6.2ohm resistors from xdp. They won't flash when my lights are on. I tried the resistor on every wires possible and still no difference. They will flash with the lights off but as soon is I turn the running lights on they go solid. Anyone have any ideas? Possibly the wrong size resistor ? And the resistors get hot as they should. Thanks

 

[plarkinjr]

Could the bulbs be in backwards? Just a wild guess on my part.

 

[BC_Cummins]

I'm having the exact same problem myself and it's driving me crazy.

I bought some really nice bright 30W Amber bulbs for my front signals. I hooked them up and thought maybe they would pull enough Watts to work without resistors, and they did. Until i started the truck and took it down the road and heard saw the "bulb out" warning pop up on the dash.

So i tried installing a resistor, and it seems after installing it on the 2 outer wires, one being a ground, and the other +signal lead, the bulb would blink fine. But once i turned the running lights on, it would stay on bright and would no longer blink.

No, the bulb was not in backwards, i did a bunch of test.

The funny thing i noticed was, when the running lights are on, both + leads at the bulb receive power. Not sure why this is but I'm pretty sure it has something to do with this problem.

I was thinking of installing some diodes thinking maybe some of the power from the LED is backfeeding somehow and causing the park light to stay on bright.

I'll test it out tomorrow and let you know the result.

Any other input would be helpful.

 

[BC_Cummins]

So i got it figured.

The LED is allowing voltage to backfeed to the signal lights wire, thus when installing the resistor, it's already getting voltage from the backfeed and causes the LED to light up bright.

I've remedied the problem by installing a diode, which basically allows current to travel in only 1 direction thus stopping the backfeed issue.

Once that issue has been remedied, now the resistor can be installed outside of the diode.

See the Diagram for installation instructions.

Hope that helps!!