Led conversion
Thread Starter
Racer
Joined: Dec 2003
Posts: 344
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From: Limmen NH, The Netherlands
Led conversion
Some time ago I converted my head lights of my 99 Vette to H4 LED (in a European headlight unit of my Germany delivered car). Since that time my highlight doors do not close when you turn off the lights (although after sometime they suddenly closes). This is appearantly due to the fact that the lights draw much less current and therefor no signal that the lights actually turned off is received by the door controller unit.
First I bought a CAMbus unit to place in the circuit (plugging it between the headlight and the cable fitting in the headlight but this didn't cure the issue).
Secondly I ordered a piece of wiring with two 6 ohm/50 w resistors parallel to the high beam and ground and low beam and ground but when I attached this the headlights would properly close when the lights were turned off but the lights wouldn't burn. Also when I used the 2 resistors in serie (2x 6 ohm = 12 ohm) with just low beam it the light wouldn't turn on (also the high beam wouldn't work which puzzled me even more since the two resistors were not places parallel with the high beam at all)...
I'm curious if someone encounter similar issues with a LED conversion and how it was resolved...
First I bought a CAMbus unit to place in the circuit (plugging it between the headlight and the cable fitting in the headlight but this didn't cure the issue).
Secondly I ordered a piece of wiring with two 6 ohm/50 w resistors parallel to the high beam and ground and low beam and ground but when I attached this the headlights would properly close when the lights were turned off but the lights wouldn't burn. Also when I used the 2 resistors in serie (2x 6 ohm = 12 ohm) with just low beam it the light wouldn't turn on (also the high beam wouldn't work which puzzled me even more since the two resistors were not places parallel with the high beam at all)...
I'm curious if someone encounter similar issues with a LED conversion and how it was resolved...
Last edited by Rob Musquetier; Jun 5, 2026 at 04:24 PM.
Advanced
Joined: Dec 2024
Posts: 94
Likes: 54
This is the easiest workaround.
Otherwise, you can wire in a load-equalizer resistor in parallel with the headlight bulbs on each side, which will stimulate the resistance of the OEM bulbs. I did that for my LED brake lights, but didn't bother with the headlights.
Otherwise, you can wire in a load-equalizer resistor in parallel with the headlight bulbs on each side, which will stimulate the resistance of the OEM bulbs. I did that for my LED brake lights, but didn't bother with the headlights.
Drifting
Joined: Oct 2002
Posts: 1,774
Likes: 66
From: SoCal
Get the c5 hi-4 harness. Even with low power led headlights I have had no issue with the doors closing. I am now running sealight s7s led headlights. High power 65 watt bulbs also would take care of your issue without the harness. I bought them because I wanted the higher output not because of the doors issue.
