New Led Headlights
Thread Starter
5th Gear
Joined: Nov 2021
Posts: 5
Likes: 0
From: Chicago
New Led Headlights
I installed new Led headlights on my 1989 C4 and they're working just fine with the low beam & high beam being turned on and off.
The problem I'm having is when I turn on my fog lights, my headlight will turn on bright. What can this problem be & how am I able to resolve
this issue? This is very annoying!!
Ed Toombs Je
evdj68@att.net
The problem I'm having is when I turn on my fog lights, my headlight will turn on bright. What can this problem be & how am I able to resolve
this issue? This is very annoying!!
Ed Toombs Je
evdj68@att.net
Pro
Joined: Mar 2007
Posts: 595
Likes: 355
From: Mt Prospect IL
2025 C4 of the Year Finalist - Unmodified
There are multiple threads on how to retire/modify fog light circuit to eliminate this problem but in a nutshell it works like this. The fog light relay is grounded through the high beam filament normally. If you switch to LEDs, When you turn on the fogs, it sends enough current to light the high beam on the LED headlights. If you change the fog light relay to ground through the chassis all works normally and you have the advantage of having the ability to turn on the fogs in both high and low beams. On my ‘96 the green wire off the fog light relay needed to be grounded, not sure which wire it is on the ‘89. Others will talk about using resistors and other fixes but grounding the relay is the easiest solution in my book. GLWR
Pro
Joined: Mar 2013
Posts: 697
Likes: 162
From: Huntington WV
There are multiple threads on how to retire/modify fog light circuit to eliminate this problem but in a nutshell it works like this. The fog light relay is grounded through the high beam filament normally. If you switch to LEDs, When you turn on the fogs, it sends enough current to light the high beam on the LED headlights. If you change the fog light relay to ground through the chassis all works normally and you have the advantage of having the ability to turn on the fogs in both high and low beams. On my ‘96 the green wire off the fog light relay needed to be grounded, not sure which wire it is on the ‘89. Others will talk about using resistors and other fixes but grounding the relay is the easiest solution in my book. GLWR
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Joined: Mar 2005
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From: Fredonia WI
2025 Corvette of the Year Finalist - Unmodified
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Check this thread
https://www.corvetteforum.com/forums...olution-2.html
I grounded the relay ... others will argue for the resistor mod
https://www.corvetteforum.com/forums...olution-2.html
I grounded the relay ... others will argue for the resistor mod
Pro
Joined: Mar 2007
Posts: 595
Likes: 355
From: Mt Prospect IL
2025 C4 of the Year Finalist - Unmodified
Thread Starter
5th Gear
Joined: Nov 2021
Posts: 5
Likes: 0
From: Chicago
There are multiple threads on how to retire/modify fog light circuit to eliminate this problem but in a nutshell it works like this. The fog light relay is grounded through the high beam filament normally. If you switch to LEDs, When you turn on the fogs, it sends enough current to light the high beam on the LED headlights. If you change the fog light relay to ground through the chassis all works normally and you have the advantage of having the ability to turn on the fogs in both high and low beams. On my ‘96 the green wire off the fog light relay needed to be grounded, not sure which wire it is on the ‘89. Others will talk about using resistors and other fixes but grounding the relay is the easiest solution in my book. GLWR
