Been reading and researching like crazy but can't figure this one out. Did a full led upgrade to the front only. Hi/lows, fog, 194 corners, 3157 in turn signals and drl. Got hyperflash and upgraded the flasher relay. Now have no issues with that. With headlights and fogs OFF, the turn signals and corners flash perfect. They flash together from off to on....and bright. When I turn either headlights or fogs on the turn signals and corners act crazy. The corner no longer blinks together with the turn signal and the turn signal flashes dim to bright instead of off and on. Assumed bleed back so added single diodes to turn signal and parking lamp wires( blue and brown). Changed nothing. Seen the corner bulbs have the same blue and brown wires so tried diodes on them also....now corners will not come on at all and turn signal bulbs still flashing dim to bright. HELP ME
LED turn signal upgrade problems on 2003 yukon denali
- Thread starter BossHog24
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Welcome to the Forum from NH.
Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.
I hope that you will become a participating member in the Forum's discussions.
Pics of the truck, please.
When you had the original flasher relay in, apart from the hyperflash, did everything else work properly?
Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.
I hope that you will become a participating member in the Forum's discussions.
Pics of the truck, please.
When you had the original flasher relay in, apart from the hyperflash, did everything else work properly?
Thanks. Yeah been following the group for years since I bought the Denali new back in 03. I'll get some pics or video up soon. Im pretty sure I was just getting hyperflash under all operations before replacing the flasher relay. My first attempt was to add resistors to turn signal wires. Tried every combination on the 3 different wires. The resistors gave me the same results as replacing the flasher relay. Perfect blinker function with no other lights on. But same problem once headlights/parking lights or fog/parking lights are turned on. Tried every combination of flipping bulbs around with no difference. It seems the issue is the dimmer parking light is not turning off when the turn signal is operated. Im guessing the diodes could be the solution but im just not sure where to use them. 5A/60v diodes btw. Thanks for any suggestions.
Tonyv__
Full Access Member
If I was you, I’d cut the corner light and splice it directly into the main turn signal bulbs. That way it will blink when the main turn signals blink….
I believe with the headlights on your turn signals illuminate in low so when turn signal is blinking it goes from dim to bright instead of off and on.
TYF can't host videos. Use a hosting service like YouTube, etc. and post the link here.
Meathead16
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If I understand you correctly it sounds like normal operation. Turning your fog lamps on, even with the headlamp switch off, will turn on your parking lights as well, including your corner lamps. So corner lamps go from being off-on, to dim-bright and the parking lamp will do the same, except they alternate. Corner light is bright while parking/signal light is dim, and corner is dim when parking/signal is bright. I believe they only flash in unison when the fog/parking/head lamps are off.
