wyyotaguy

Appologies if this posted in the wrong area.

I have a 92 pickup and trying to convert the headlights over to LEDs. I bought a set off Flebay (ebay) that said fit it. Other than wiring being not being a direct match to the trucks all is good. Now the problem. Matched all wires up from lamps to the trucks. Turn on the lights and have High beams on what should be low. Yes checked and had everything wired up correctly. If hit HI I get all lights still on but reduced power. If swap the hi an low wires round I get Low only and no HI when hit HI. Have tripple checked the truck harness colors and LED lights that am matching all up correctly.

Am completly stumped and at a loss. So much for a simple afternoon swap out.
Any help is much appreciated at this rate.

scope103

Toyota's are "switched ground." Your cheap LED headlamps are designed for switched 12v.

You can buy sets of relays and cables to get your headlamps to work. You can wire in an inexpensive bridge rectifier to do it without moving parts, but if your headlamps don't have a constant-current source, then the two diode-drops will dim them.

OR, you can get real LED headlamps that will work on either switched ground or switched 12v (Truck-lites claims theirs will.)

RAD4Runner

Like Scope says ^^^

+1 for Truck-lites.
Guaranteed high quality and spread and cut-off are legit; you would not be joining the legion of a$$holes who blind the Gods with their headlights.

Truck-Lites review: https://www.yotatech.com/forums/f131...l#post52311149

High Alt Gold Miner

RAD, which model # of Truck-Lites do you have?

RAD4Runner

Truck-lites model 27450C, Plug-n-Play. here

High Alt Gold Miner

Nice! They look great in your write-up. Thank you... just added them to my wish list on Amazon and will likely order them after the holidays.

dropzone

iTrader: (6)

Like Rad4runner I had the truck lites in my 81, expensive but well worth it

even tried to out them in my 94 4runner but trying to rework the mounts was gonna be too big of a pain

wyyotaguy

Scope could you post or message me a wiring diagram setup for both using the relays and or the bridge rectifier for connecting to the lights.
Thanks

RAD4Runner

Mind sharing how you did that, and schematic from manufacturer / vendor how lights are supposed to be hooked up?
Does manuf/vendor say IF lights are polarity-sensitive?

wyyotaguy

Let me clarify this sense some people can't understand things.

Bought them off ebay. There is nothing in the listing that says they are positive or negitivly switched. All it said was that they would FIT my vehicle. Plug and play setup and no mentioning of anything else. In the listing it showed the 3 terminals and what one was what.(Low,Hi,Ground) When compaired the picture to my ACTUAL headlight wiring plug, headlight didnt match up to the truck. I cut the plug off from the lamps and put new terminals on them and put them in the corasponding correct plug of the trucks harness. The resulds is at the top of the post.

RAD4Runner

Sorry to bear bad news... Even if you upgrade to housings that allow your choice of bulbs, an H4 conversion harness is still more essential.
Stock wiring on first and second (i think) gens makes close to 10 amperes of current for the headlights travel over a convoluted path, including the headlight dimmer-combo switch (stalk).
Results:
1) Reduced actual power that reaches the headlight bulbs, AND
2) Shortened life of the dimer switch contacts.
See 4Crawler's Explanation here. Webpage also shows a schematic if you want to assemble your own.
If you search the forum you'll find schematic for H4 conversion, too.

Repeat:
See comparison between "semi-sealed" (Auto-Pal housing with Sylvania bulbs) and Trucklites here: https://www.yotatech.com/forums/f131...l#post52311149