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Aftermarket LED taillight issue

Aftermarket LED taillight issue

Postby Mrroberts2u [OP] » Sep 20 2020, 1:24pm

Hey all! I bought a 10 Silverado Z71. After doing some work I noticed the taillights weren’t working. I wanted to upgrade them anyway so I bough a pair from Amazon. Went to install them and noticed the reverse light was too small. No problem, so I also ordered new harnesses that would accept the correct 3047 bulb(led);Installed everything correctly but for what ever reason the driver side turn continues to hyper flash.
Here’s what I have done:
Switched driver housing to passenger no hyperflash And vice versa
Reinstalled OEM driver harness Hyperflash stopped but reverse light didn’t fit new housing as it was the 921 style bulb
Bought new driver side harness and reinstalled; hyperflash continued.
Also, I will need to reconnect the aftermarket camera back to the tail light or maybe the trailer plug for it to work again.

What can I do? I am at my wits end! Should I replace the junction box? What about a LED compatible flasher relay?

Any and all help will be much appreciated.
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Re: Aftermarket LED taillight issue

Postby Larry-Cleveland » Sep 21 2020, 2:27pm

First of all, you do not have a flasher relay the BCM (body control module) is doing this for you. The BCM is seeing less restance and thinking that a bulb is out and flashing fast. In general LED bulbs have less restance.

Did the tail lights come with the LED bulbs? If so it is their problem.

When you swap right to left you do have something that works on the right side as I believe the BCM is monitoring ALL of the lights for hyper flashing... I think :)

Did you try swapping just the (good) bulbs from the right to the left?

Did you try to put a standard bulbs in the left side reverse?

Make your testing smaller by just moving one bulbe at a time.

Intermix standard bulbs to see if that helps.

It will be something simple like you have a front bulb out...
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Re: Aftermarket LED taillight issue

Postby ricka182 » Sep 21 2020, 3:13pm

You need to either have the BCM flashed, which is big bucks, or use a bunch of resistors wired in, one for each LED directional...I don't think you need them for the other light functions..
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Re: Aftermarket LED taillight issue

Postby Larry-Cleveland » Sep 21 2020, 3:23pm

But if he moves the right assembly to the left and it works fine there is a component problem.

He needs to determine what component is causing the problem by swapping individual items and not the entire assembly to find the problem.

As best as I can see across the internet. :)
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Re: Aftermarket LED taillight issue

Postby Zrock » Sep 21 2020, 3:39pm

the issue may be somewhere else and not with the component.. But if those lights you bought did not have the resistors preinstalled then you are going to have to order some resistors to balance the load. The computer is seeing a loss in load and thinks the light is out hence the hyper flash. Not sure about pickups but some bug rigs the l lights are controlled by 2 different computers dependent on what side of the truck...
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Re: Aftermarket LED taillight issue

Postby Larry-Cleveland » Sep 21 2020, 3:50pm

But the puzzling factor here is that if he moves the working harness and lamps to the left side and it works fine it must be something in that assembly that is different than the one that normally goes on the left side.

Testing each lamp and wire should tell you what the difference is.
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Re: Aftermarket LED taillight issue

Postby Mrroberts2u [OP] » Sep 21 2020, 8:04pm

Well, well. I got it figured out. To respond to some of the comments above. I was pretty sure I didn’t have the flasher, but wanted to make sure. (Google isn’t always friendly). The taillights came installed with the leds
(Similar time the Spyder) and resistors.

Okay so for whatever reason. The harnesses I bought worked great. The assembly in the right side is plugged into the top socket and worked correctly. So obviously you would mimic on the other side. Not with this light. I used the long socket on one and short in the other. Something maybe about resistance as the flashers on this truck are dual filaments.
Another thought, I did have to replace the left turn signal fuse. Is it possible that the fuse was already going bad and might of caused the hyperflash?
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