Utilizing auto high beams with light bar on upfitter switches - Diesel Forum - TheDieselStop.com
 
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post #1 of 7 (permalink) Old 12-10-2018, 01:01 PM Thread Starter
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Utilizing auto high beams with light bar on upfitter switches

So in theory my idea makes sense, at least to me, but not sure how all of the fancy wiring in these trucks would handle it.


Basically, my thought is to have a small LED light bar run off the upfitter switches, but tie it in to the auto high beams so that it would kill the light bar when it kills the high beams. My concern is that whatever load it would take to run the relay involved would throw the truck off, but I don't know if it would be an issue or not.


This way I could run just the regular high beams when I wanted, but if I'm out in the middle of nowhere I could add a light bar to the high beams with a flick up of the upfitter switch but still have it safely kick off if there's oncoming traffic.


On an older vehicle I would have zero concern over wiring up something like this into the high beams, just not sure if the sensitivity of these modern vehicles would cause issues.

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post #2 of 7 (permalink) Old 12-13-2018, 10:44 AM
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I put this article together a LONG time ago, but it might help if you can get past the computer side of things.

The only issue I see with your plan, is the same I ran into with mine. My Aux lights needed to be turned off significantly sooner than my high beams because they reached WAY down the road. So perhaps you could take that into consideration when buying your LED's.

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post #3 of 7 (permalink) Old 12-18-2018, 06:44 AM
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You didn't state LED headlights or standard bulbs are on your truck.

Thinking at the relay level. There's very little draw required to activate the relay so that "feed" should not cause an issue with the truck computer.

So a wire off either side headlight harness (high beam) feeds the signal side of a relay. The appropriately rated relay then has the main power side fed from the upfitter switch. The power out of the relay then feeds the LED bar. Just make double-sure that the relay Ground is good.

Seems like you are just going to add a relay after the upfitter power out (already relay controlled).

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post #4 of 7 (permalink) Old 12-18-2018, 07:56 AM
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In order to assist you we will (as mentioned) need to know what you headlamp type and configuration is. Halogen or LED and one or two lamp assemblies? It makes a difference in the wiring. BUT - regardless of what you have all of the headlamp options use FET circuits which the module powering the lamps uses to shut the circuit off if an overload is detected. You will need to tap your relay into one of those circuits and there is no way to tell if the relay will exceed the tolerance and shut the circuit off without just trying it. This is the only way to do what you want to do as everything else about the headlamp system involves modules and networking. The good news is that it's the simplest and easiest way. Just be advised that in the event that you do trigger the module to shut down the circuit you tap into you will likely need a scan tool to run a self test on the appropriate module (light type and configuration dependent) and clear any codes set as a result before the circuit will be turned back on.


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post #5 of 7 (permalink) Old 12-18-2018, 02:58 PM Thread Starter
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ford_doctor, was hoping you'd chime in! I do have the LED headlights on my truck. Not sure how many lamp assemblies there are, it's just the factory LED headlight setup w/ fogs.

JD, I've actually been pretty surprised at how far out the truck will shut off the auto high beams. We were out a couple weeks ago SE of Greeley and the truck was shutting the lights off plenty far enough away for any LED light bar I'd be putting on the truck!

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post #6 of 7 (permalink) Old 03-11-2019, 01:49 PM
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Dave,

Did you ever complete this mod? How did you end up doing it?

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post #7 of 7 (permalink) Old 03-12-2019, 04:07 PM Thread Starter
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I have not pursued this any further, but it is still on the to-do list.

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