TRS LED lights - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 08-11-2019, 11:21 AM Thread Starter
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TRS LED lights

I just received and installed front turn, marker and rear brake/turn and backup LED lights from TRS (The Retrofit Source) on my 13 F350 Lariat. Love the look and quality. Nice and bright. The rear brake and turns were plug and play, no issues. However, the front turn signals (3157 Profile Peak - Amber) only blink when the running light are off. When running lights are on they do not blink. Rear lights function perfect. I activated the no hyper flash config via Forscan. I do not have a load resistor as I expected these to be plug and play. Any recommendations on a fix?

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post #2 of 12 Old 08-11-2019, 01:11 PM
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Can you post the specific part number you used up front?



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post #3 of 12 Old 08-11-2019, 01:18 PM
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sounds like you didn't order switchback lights.

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post #4 of 12 Old 08-11-2019, 01:53 PM Thread Starter
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Originally Posted by HeavyAssault View Post
Can you post the specific part number you used up front?
I ordered 3157: PROFILE PEAK (Amber).

Sight says: There is known issues with how the factory wiring functions using the X-VF switchback bulbs. Because of these known issues, we cannot recommend them for Ford or Tacoma / Tundra vehicles at this time.

So I did not get the switch back for that reason. I just want it to blink when the running lights are on.


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post #5 of 12 Old 08-11-2019, 02:00 PM
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I think you have to run switch backs. Your standard bulb had two filaments, one for a parking lamp the other for a signal. It wasn't one light. The LED must have a toggle or secondary set of LEDs to illuminate in order to go back and forth.
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post #6 of 12 Old Yesterday, 05:01 AM Thread Starter
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I called TRS and they recommended a load resistor. I did not think it was necessary but hopefully it will work. Order and should be here by end of week.

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post #7 of 12 Old Yesterday, 08:05 AM
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I called TRS and they recommended a load resistor. I did not think it was necessary but hopefully it will work. Order and should be here by end of week.

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Well, I hope that works for you but honestly I don't see how a load resistor will help at all. Resistors are put in should you not be able to use FORScan to alter the computer; essentially the resistor is just sucking up extra 'power'. It will however heat up which can cause a fire. I run switchbacks and they work fine without any additional non-sense.

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post #8 of 12 Old Yesterday, 09:05 AM
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When resistors are wired correctly and mounted correctly there are no issues. I've used mine forever it seems now on LED turn/running switch backs. Yes, I could have used ForScan but didn't...either way works.


Using ForScan all you are doing is telling the PCM to ignore the voltage/amps on the turn/running wiring that trips the hyper-flash....which is nothing more than an "alarm" that you have a burnt out bulb.


Installing a resistor just "mimics" the expected voltage/amperage that the PCM uses to identify a properly operating turn/running light bulb compared to one that is burnt out. The resistor causes a load on the electrical wire and keeps the PCM saying "Nothing wrong there, no hyper-flash" since LEDs have a much lower load over a filament style bulb.



One should be aware of what wire color is used on the turn signal as compared to the running light. If you wired it to the wrong side (or both at the same time) the resistor would be getting power all the time. Hence it would get VERY hot. Whereas if it's wired into just the turn signal wire it's going to get power ONLY when the turn signal is in use.

Now if you are running the 4-way Emergency flashers....yea....it's going to get hot.



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post #9 of 12 Old Today, 02:50 AM Thread Starter
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Thanks for the input. Maybe I just go back to incandescent for front turn signals and be less cool. I really like the brake and backup LEDs.

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post #10 of 12 Old Today, 02:58 AM
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Thanks for the input. Maybe I just go back to incandescent for front turn signals and be less cool. I really like the brake and backup LEDs.

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There are plenty of switchbacks that will do exactly what you want. So if you want that look, start looking at them. Here is what I run: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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