Led headlights won't work?
02-18-2017, 06:08 AM
#1
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Led headlights won't work?
92 pickup. Currently have the stock sealed beams I orders a pair of led headlamps to put into it and I plug them in and they don't work. I looked up a wiring diagram and it seems as my truck uses grounds to change high and low not a power to change high and low. And I know a halogen can be wired either way and a led can only be wired one way to work. So I have constant power but my grounds switch for the lights. Is there an adapter out there for this to work. Otherwise it will take alot of wiring and relays and fuses and what not to make it work... is there somthing simple out there. Thanks for your time. Please help me out here.
02-18-2017, 10:59 AM
#2
There must be a simple fix, but please do your homework first and let us know what LED light you are dealing with, wiring diagram to your LED light.
BUT if it is one of those non-DOT approved LED headlights that light up the sky and blind others, PLEASE PLEASE PLEASE BE CONSIDERATE AND RETURN IT.
BUT if it is one of those non-DOT approved LED headlights that light up the sky and blind others, PLEASE PLEASE PLEASE BE CONSIDERATE AND RETURN IT.
02-18-2017, 11:28 AM
#3
But we will ignore the safety issues and tell you. Any random relay harness you find on eBay or another online supplier will either work plug and play or only require swapping some wires around.
Don't forget you'll need to do some alterations no matter what you source if it's not a Toyota specific harness that includes the work around to activate the high beam indicator when appropriate.
02-18-2017, 11:45 AM
#4
Legit, great spread, sharp cut-off, safe, considerate and 100% plug-and-play... trucklites.
02-18-2017, 01:06 PM
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All you need to do is pop the pins out of the headlight socket and reverse them. Of course, you'd want to use jumper clips first to confirm that polarity is your problem.
And please do check that the lights are DOT approved. Otherwise, even swapping pins in a connector isn't worth your time.
02-18-2017, 02:49 PM
#6
Wiring, relays and fuses? I'd like to see that wiring diagram.
All you need to do is pop the pins out of the headlight socket and reverse them. Of course, you'd want to use jumper clips first to confirm that polarity is your problem.
And please do check that the lights are DOT approved. Otherwise, even swapping pins in a connector isn't worth your time.
All you need to do is pop the pins out of the headlight socket and reverse them. Of course, you'd want to use jumper clips first to confirm that polarity is your problem.
And please do check that the lights are DOT approved. Otherwise, even swapping pins in a connector isn't worth your time.
It's three pins one power two grounds, you can not swap that and have selectable lights.
Not at the plug side at least, you could rewire the lamps if it's not a sealed unit.
Switched ground to switched power harnesses are on eBay.. probably from the same guys selling the led headlight lamps.
02-18-2017, 04:21 PM
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Yikes! You're right. The LED headlamps are (almost certainly) wired internally with one "minus side" (cathode) and two "plus sides" (anode) (for the high/low beam).
Fixing that will not be nearly as simple as I thought. Sorry.
Fixing that will not be nearly as simple as I thought. Sorry.
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02-18-2017, 11:10 PM
#9
Yes, on each trucklites legit LED sealed beam there is one positive side common to both low and high beam filament that connects to the headlight fuse. The headlight control circuit selects high beam or low beam by grounding the separate ground sides for low and high beam filaments. IF O.P.'s circuit is stock but LED lights do not work with it, the LED lights must not be the right ones for the truck, and yes, it would require a harness that converts switched ground to switched power.
Last edited by RAD4Runner; 02-18-2017 at 11:11 PM.
02-20-2017, 04:22 PM
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sorry for not getting back quickly. But yeah there is the diagram for my truck does that help anyone in any way? Seems like everyone is understandING my situation. Am I right? If so has anyone actually found an adapter?
02-20-2017, 08:04 PM
#13
One POSITIVE input for low beam
One POSITVE input for the high beam
One COMMON negative/ground for both beams.
If this is the case, find an H4 conversion harness that has separate positive outputs for the high and low beam filaments and ONE common ground pin. I believe the common H4 conversion harnesses being sold online works this way. Other members who had bought some would know.
Regardless of the above, I still implore you, IF your LED Lights are not DOT-approved, to not join the band of A$$holes who light up the sky and blind others with their non-DOT-approved headlights.
02-21-2017, 05:29 AM
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If trick30s LED headlights "don't work," you are almost certainly correct. But there's only one person who would know for sure; the one holding the documentation that came with the lights.
After my gaff, I took a look to see if I could find such a harness. There are lots of H4 harnesses, but they either just add relays to keep the headlight current out of the stalk switch (advertised as eliminating dimming), or they are for later-model vehicles that misinterpret the low-current of the new LED headlamps as a burned-out bulb, and give a false warning.
Neither of those types of harnesses will do the polarity reversal as (correctly) described by RAD4Runner.
From an electrical standpoint, I can't see any reasonable way to do that without two relays, exactly what trick30 said he didn't want. If it were me, I have no trouble wiring up a pair of relays, but I wouldn't bother. I'd return the headlamps and get the right ones.
Neither of those types of harnesses will do the polarity reversal as (correctly) described by RAD4Runner.
From an electrical standpoint, I can't see any reasonable way to do that without two relays, exactly what trick30 said he didn't want. If it were me, I have no trouble wiring up a pair of relays, but I wouldn't bother. I'd return the headlamps and get the right ones.
02-21-2017, 11:15 AM
#15
If trick30s LED headlights "don't work," you are almost certainly correct. But there's only one person who would know for sure; the one holding the documentation that came with the lights.
After my gaff, I took a look to see if I could find such a harness. There are lots of H4 harnesses, but they either just add relays to keep the headlight current out of the stalk switch (advertised as eliminating dimming), or they are for later-model vehicles that misinterpret the low-current of the new LED headlamps as a burned-out bulb, and give a false warning.
Neither of those types of harnesses will do the polarity reversal as (correctly) described by RAD4Runner.
From an electrical standpoint, I can't see any reasonable way to do that without two relays, exactly what trick30 said he didn't want. If it were me, I have no trouble wiring up a pair of relays, but I wouldn't bother. I'd return the headlamps and get the right ones.
After my gaff, I took a look to see if I could find such a harness. There are lots of H4 harnesses, but they either just add relays to keep the headlight current out of the stalk switch (advertised as eliminating dimming), or they are for later-model vehicles that misinterpret the low-current of the new LED headlamps as a burned-out bulb, and give a false warning.
Neither of those types of harnesses will do the polarity reversal as (correctly) described by RAD4Runner.
From an electrical standpoint, I can't see any reasonable way to do that without two relays, exactly what trick30 said he didn't want. If it were me, I have no trouble wiring up a pair of relays, but I wouldn't bother. I'd return the headlamps and get the right ones.
Anyways go here read lots buy his stuff or diy and send him a thank you note..
http://www.4crawler.com/4x4/CheapTri...shtml#TechInfo
Last edited by Co_94_PU; 02-21-2017 at 11:16 AM.
02-21-2017, 11:37 AM
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Seems Truck-Lite claims that their LED head lamps are NOT polarity sensitive. https://www.truck-lite.com/content/f...rity-sensitive Go figure.
02-21-2017, 12:00 PM
#17
P.O. Needs a SWITCHED-POWER H4 Conversion Harness.
...Neither of those types of harnesses will do the polarity reversal as (correctly) described by RAD4Runner.
02-21-2017, 12:17 PM
#19
Yes, I do (here) and am very happy with them.
Plug and play, so not worth a write-up.
Great spread
Sharp cut-off,
Less power consumption, of course.
Only con is that there is a hot spot on each bulb's pattern (Haven't taken a picture of it nor written TL about it, yet). The hot spots point a little higher than the over-all cur-off, so I'm putting those to good use by aiming them at the lane reflectors so I see those ahead of time.
Other potential con is because of cooler lenses, snow may accumulate on them. Not a problem where I am
.
Plug and play, so not worth a write-up.
Great spread
Sharp cut-off,
Less power consumption, of course.
Only con is that there is a hot spot on each bulb's pattern (Haven't taken a picture of it nor written TL about it, yet). The hot spots point a little higher than the over-all cur-off, so I'm putting those to good use by aiming them at the lane reflectors so I see those ahead of time.
Other potential con is because of cooler lenses, snow may accumulate on them. Not a problem where I am
.
10-31-2017, 08:14 PM
#20
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Correct.
Yes, on each trucklites legit LED sealed beam there is one positive side common to both low and high beam filament that connects to the headlight fuse. The headlight control circuit selects high beam or low beam by grounding the separate ground sides for low and high beam filaments. IF O.P.'s circuit is stock but LED lights do not work with it, the LED lights must not be the right ones for the truck, and yes, it would require a harness that converts switched ground to switched power.
Attachment 110814
Yes, on each trucklites legit LED sealed beam there is one positive side common to both low and high beam filament that connects to the headlight fuse. The headlight control circuit selects high beam or low beam by grounding the separate ground sides for low and high beam filaments. IF O.P.'s circuit is stock but LED lights do not work with it, the LED lights must not be the right ones for the truck, and yes, it would require a harness that converts switched ground to switched power.
Attachment 110814
https://youtu.be/yrjbcTU_GTc
