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Old 12-28-2015, 03:33 PM
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Need an electrical nerd

Okay so I'm helping Delta Tech with their flickering issue on my headlights. We are trying to create an antiflicker harness, but they keep flickering. Does anyone know what's exactly inside these?
http://www.amazon.com/Truck-Lite-Hea...92ZJHQBHXXWSR3

We have tried a resistor for the highs and another for the lows, but that didn't fix it. something along the lines of this: Lifetime LED Wrangler Anti Flicker Harness H13rh (07-16 Wrangler JK) - Free Shipping

Any ideas on what they should make? (I am not affiliated with them, just trying to help them improve their product)

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Old 12-28-2015, 04:40 PM
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Bump, are they capacitors?

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Old 12-28-2015, 04:45 PM   #3
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There are threads on here from a few years ago suggesting a certain size (uf : Microfarad) capacitor.
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Old 12-28-2015, 06:50 PM
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There are threads on here from a few years ago suggesting a certain size (uf : Microfarad) capacitor.
is it this one?
https://www.wranglerforum.com/f202/he...y-1080098.html
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Old 12-28-2015, 06:57 PM   #5
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No. I found it two days ago. It was posted three or four years ago because of the first generation LED headlights and fogs flickering. I'll try to find it again. A google search using Jeep Wrangler Forum in the wording works better than the forum search.
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Old 12-28-2015, 07:49 PM   #6
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Sounds like they need to hire an electrical engineer.

That gizmo from TruckLight converts a PWM signal into a solid DV signal. It's not just a capacitor.
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Old 12-28-2015, 08:02 PM   #7
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Theres a good write up here about PWM:

https://www.wranglerforum.com/f274/cl...s-1054553.html
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Old 12-28-2015, 09:09 PM   #8
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It's "just" a capacitor, this way it keeps the voltage at a constant 12-14V instead of the changing voltage of the PWM circuit. The capacitor stores up enough energy to maintain a 12V output through the <12V cycles of the PWM circuit, so the lights never end up actually seeing the voltage change
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Old 12-28-2015, 09:13 PM   #9
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Quote:
Originally Posted by ShutterBug View Post
Sounds like they need to hire an electrical engineer.

That gizmo from TruckLight converts a PWM signal into a solid DV signal. It's not just a capacitor.
This is typically called an L-C Output Filter, you can read about it a bit more in depth here:
Capacitor Selection is Key to Good Voltage Regulator Design | DigiKey

Still really just a capacitor.
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Old 12-28-2015, 09:23 PM   #10
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And one last article. This person created their own version of a fix, which seems a bit overkill but I get why they may take this approach. They used a 100uf 35v capacitor to eliminate the PWM flutter on their relays.

Headlight harness how-to - JKowners.com : Jeep Wrangler JK Forum
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Old 12-28-2015, 10:36 PM   #11
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The downside to all of the harnesses I've seen so far is that they have a delay (capacitor discharge time) when the beams are turned off. On my setup (the quadratec harness) there's about a half second, delay, which isn't bad, but still annoying.

I don't think there's a reasonable way around that, without listening to the CAN bus signals the TIPM gets to turn the high beams off. Which is certainly one of the problems I'm tackling right now.
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Old 12-29-2015, 01:04 PM
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The downside to all of the harnesses I've seen so far is that they have a delay (capacitor discharge time) when the beams are turned off. On my setup (the quadratec harness) there's about a half second, delay, which isn't bad, but still annoying.

I don't think there's a reasonable way around that, without listening to the CAN bus signals the TIPM gets to turn the high beams off. Which is certainly one of the problems I'm tackling right now.
I wonder if the PWM were to be built into the headlight if that would solve the delay?
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Old 12-29-2015, 01:19 PM   #13
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I wonder if the PWM were to be built into the headlight if that would solve the delay?
I don't think so, as you're still dealing with capacitor discharge time. I don't think (caveat!) you could have an LED solution that would work with PWM without flickering due to their response time.

You really want a non-PWM power signal coming from something that knows when the TIPM is turning off the lights, so it can control its own relay. Problem goes away then. But that's a lot of work to get rid of a 0.5s delay that most people get used to.

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