Wire LED into 2012 F350

X-Treme · Nov 11, 2015

Stompin Tom said:
Here is an example for you, winding roads, traveling in the dark with your high beams and driving lights on it is often hard to see indicators of oncoming traffic such as lights reflecting off trees. If you can detect somebody is coming from around the corner you can turn your highbeams off before your staring strait at them so nobody gets blided. 2nd example, traveling in urban areas you can often use your high beams but if you also have your LED or HID driving lights the reflection off of traffic signs causes you to blind yourself. Turn off the driving lights all is good. 3rd example, believe it or not some vehicles have their daytime running lights wired through the high beam side, if this is the case your light bar will also be on with your daytime driving lights if you dont have it switched. 4th example, driving at night in snow, often times you get to much glare from your driving lights but can run fine with high beams on.

All great examples. and, I thank you for them. Now, if you would have just answered this question like this in the first place, instead of jumping down my throat, this thread wouldn't have had an extra 5 sideways posts.

Stompin Tom · Nov 11, 2015

X-Treme said:
All great examples. and, I thank you for them. Now, if you would have just answered this question like this in the first place, instead of jumping down my throat, this thread wouldn't have had an extra 5 sideways posts.

"If you're gonna have a switch anyway, why wire it into the high beam circuit? Just run it off the switch period"

and if you had asked the question as you did in your edited post that would have been clearer rather than the way you originally asked your question as I have quoted here.

Grizzly4323 · Nov 12, 2015

I have run into an issue. All the wiring is correct to the relay as was shown in schem. (Checked several times) but what is happening when I turn the high beam switch on it is blowing the 15 amp fuse.
Now I thought I damaged the light so I hooked the light directly to the battery, white to pos (Big spark) there is a lot of power arching and that is with the light not grounded. Then I hooked the light to the battery charger to check it, pos to pos and neg to neg and the light works fine.

I'm missing something here!! Does the light need a regulator to reduce voltage, a heavier fuse or??

Highfly · Nov 12, 2015

No, you should not need a regulator. The idea of using a relay is they take very very little voltage to trip the circuit. Once it is tripped you are sending 12 volts straight through to your lights with out adding aditional load to your high beam circuit.
Im wondering if your truck has some freack curcuit and maybe works off a grounding curcuit. Maybe lights are hot all the time and the you are actually grounding the cuurcuit instead of exciting it with 12 volts. Check the high beam wire to ground and see what you have.

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X-Treme · Nov 12, 2015

Without looking at a wiring diagram, this is just a guess, but these newer vehicles are more and more often controlling lights with body or lighting control modules. So, a lot of the time, there is a constant hot to the light, and the module controls the ground circuit. You're definitely gonna want to either get in there with a test light or meter, or get yourself a wiring diagram, and check this all out before you go hooking stuff up, and possibly burning something up.

Highfly · Nov 12, 2015

If that is the case it still can be done. We will just use a relay to conect a ground curcuit.

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X-Treme · Nov 12, 2015

Highfly said:
If that is the case it still can be done. We will just use a relay to conect a ground curcuit.

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Oh, absolutely.

Grizzly4323 · Nov 12, 2015

Glad you guys know wtfack is goin on here!!

lloydguy · Nov 12, 2015

As other's have said ,you need to find out what is leaving the switch( +/ - or possibly could be multi plexed)
(one wire run's several system's depending on what resistance is input)
If you have a multi meter hook it up to the wire you are using as your trigger for your relay and find out
if it goes pos or neg when you click your high beams on.
If it goes neg. you need put 12volt power to pin 85 and your neg trigger to 86.

Relay's are very simple, whatever you put in on 30 will come out on 87.
and to activate it you need the opposite on pin 85 as you have on 86.
If your headlight switch does output negative instead of pos. jump power from 30 to 85
and put your neg from high beam wire to 86.

Cableguy · Nov 13, 2015

^^^^^^
exactly most of the new trucks are negative switching so what lloydguy says is the correct way for that style

Wire LED into 2012 F350

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