Adding LED's
Thread Starter
4th Gear
Joined: Aug 2020
Posts: 4
Likes: 0
From: York PA
Adding LED's
Hello,
88 C4, first vet and loving it. Want to switch out some of the exterior lighting for LED's. Did the headlights already and lost the fog lights. Switched out one of the parking lights and lost the marker light for that side. I have read and heard about the use of a resistor. Is that true and if so how and where please?
Thank you
88 C4, first vet and loving it. Want to switch out some of the exterior lighting for LED's. Did the headlights already and lost the fog lights. Switched out one of the parking lights and lost the marker light for that side. I have read and heard about the use of a resistor. Is that true and if so how and where please?
Thank you
Pro
Joined: Mar 2007
Posts: 594
Likes: 354
From: Mt Prospect IL
2025 C4 of the Year Finalist - Unmodified
In my opinion it is easier to ground the fog light relay than bothering with the resistor. Big advantage is the fogs work with low and high beam. I haven’t messed with running lights yet, maybe this summer.
Thread Starter
4th Gear
Joined: Aug 2020
Posts: 4
Likes: 0
From: York PA
Thank you again
Drifting
Joined: Feb 2017
Posts: 1,274
Likes: 399
From: Tacoma WA
2024 C4 of the Year Finalist - Unmodified
Search the forum using the advanced search putting “LED” in the search. You will find many but the ones by “Nomake Wan” and “Circuit doctor” will give you the most information. Nomake Wan post was on 4/7/20 and the Circuit Doctor starts back 2015.
Pro
Joined: Mar 2007
Posts: 594
Likes: 354
From: Mt Prospect IL
2025 C4 of the Year Finalist - Unmodified
I just dropped the passenger side lower dash (carpeted piece by your knees) and the relay box is there. I then found the ground wire coming from the relay, on my 96 it was a green wire with black stripe, not sure about your 88. Cut and Ground the wire coming from the relay and tape off the side going into the harness. Reinstall lower dash and voilà.
Racer
Joined: Mar 2020
Posts: 387
Likes: 148
From: Langton, Ontario, Canada
2025 C4 of the Year Finalist - Unmodified
When you do the lights under the hood, it pays to solder the mercury switches to the LED bulb. That way it still shuts off when you close the hood.
