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I use these halogen headlights.
hella https://www.amazon.com/gp/aw/d/B001G72VIK?tag=ihco-20
LEDs, being a diode, need the current to flow in one direction. On most vehicles you have positive to the low beam, positive to the high beam, and the third prong is ground. This is the direction the LEDs need. Toyota trucks are wired backwards.Interesting - Can you elaborate on what issues you had with the LED and switched ground?
yes this is what we did although my friend had to modify the H4 harness , it would not work out of the box ( it may have been because they were for 4 headlight systems ) , i have a schematic from him somewhere . i had him make me 10 of them i was going to try selling them but never went forward with it , for one thing i dont think theres enough demand for converting old toys to LED but they really do a way better job than halogensLEDs, being a diode, need the current to flow in one direction. On most vehicles you have positive to the low beam, positive to the high beam, and the third prong is ground. This is the direction the LEDs need. Toyota trucks are wired backwards.
On Toyotas you have positive to the third prong. The high beam, and low beam, are grounded through the light switch. The solution is an aftermarket harness like they use for H4 conversions.
we might be talking apples to oranges here , ive seen different lights called the same thing ,I AM NO EXPERT , there is Xenon, HID, LED ect .H4 i believe are dual filament . i dont think the LEDs i have have a circuit board unless its sealed inside the unit but it might i got them off ebay for cheap , they are not DOT approved and said not legle for on hiway use on the box they are actually a bunch of small LED diodes and when you hit lowbeam it just shuts some of them off ,the reason i didnt go with the H4 filament type lights is i read they didnt do well with heavy vibration . mine look similar to this pictureOn further research I see that the constant 12 volts to the LED circuit board in the sealed version of the LED headlight causes a constant "on" condition even when the light switch is in the off position on a Toyota. The LEDs will have a faint glow to them in the switch off position, and will eventually kill the battery from the low current draw. I think that the H4 LED conversion bulbs that I am using may have a different circuit board in them, thus not presenting this issue. My headlights are actually off when they are off. Feedback is appreciated....