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Blinkers blink to fast after installing flatbed.

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3 years 4 months ago #45717 by ptrans
2017 Chevy Silverado 1500 LTZ this vehicle came out of the factory with led brake and turn equipped. With incandescent bulbs to LED 6 OHMS always did the trick The flatbed has LED turn, brake and tail lights. I am having a hard time satisfying the body control model to make the blinkers blink correctly. Has anyone had this type of problem???

Paul Townsend

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3 years 4 months ago - 3 years 4 months ago #45719 by Matt T

ptrans wrote: 2017 Chevy Silverado 1500 LTZ this vehicle came out of the factory with led brake and turn equipped. With incandescent bulbs to LED 6 OHMS always did the trick The flatbed has LED turn, brake and tail lights. I am having a hard time satisfying the body control model to make the blinkers blink correctly. Has anyone had this type of problem???


The factory lights might have resistors in them so the BCM can be used with led or incandescent. I'd test current draw of both the factory lights and the flatbed leds to see if they're significantly different. Then if the flatbed is lower add resistors to get it about the same as factory.

Also take a look in the BCM to see if it's set any blown lamp codes. They might need cleared to get the blinkers working normally.
Last edit: 3 years 4 months ago by Matt T.
The following user(s) said Thank You: Noah, Andy.MacFadyen

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3 years 4 months ago #45724 by ptrans
I will try to get a hold of the original lights and give that a try. Thank you.

Paul Townsend

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3 years 4 months ago #45729 by Noah
I think Matt meant to measure the current of the front lamps and try to match that in the rear.

Correct me if I'm wrong...

"Ground cannot be checked with a 10mm socket"

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3 years 4 months ago #45731 by Matt T

Noah wrote: I think Matt meant to measure the current of the front lamps and try to match that in the rear.


It would be better to check the OE rears so that you're comparing apples to apples. Though I was assuming Paul was the one who switched the beds and would have the OE lamps available.

If the front turns are LED checking them would be better than nothing. If they pull a couple amps they've got resistors to mimic incandescents. That would strongly suggest the rears would be similar but wouldn't guarantee it.
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3 years 4 months ago #45732 by Noah

Matt T wrote:

Noah wrote: I think Matt meant to measure the current of the front lamps and try to match that in the rear.


It would be better to check the OE rears so that you're comparing apples to apples. Though I was assuming Paul was the one who switched the beds and would have the OE lamps available.

If the front turns are LED checking them would be better than nothing. If they pull a couple amps they've got resistors to mimic incandescents. That would strongly suggest the rears would be similar but wouldn't guarantee it.

Thank you Matt!

"Ground cannot be checked with a 10mm socket"

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3 years 4 months ago #45739 by ptrans
I did not install the flat bed.But i will have the original rear lights today.Thank You All.

Paul Townsend

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3 years 4 months ago - 3 years 3 months ago #45809 by ptrans
This is what we had to do to fix to blinker problem on the flat bed.

File Attachment:

File Name: Document2.pdf
File Size:304 KB

File Attachment:

File Name: Document2.pdf
File Size:304 KB

Paul Townsend
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Last edit: 3 years 3 months ago by ptrans. Reason: SHOW THE JOB DONE WITH WEATHER PROOF RELAYS AND CONNECTORS.

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