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Old 07-13-2019, 06:23 PM   #1
blackgoat90
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LED Taillights with Load Resistor and DRLs

So I wouldn't have thought these would be related, but I just put some LED tail/brake lights in and they look great, but my DRLs now shut off everytime my foot is on the brake pedal. I have HIDs with their own wiring harness to the battery so turning them on and off isn't good for them. Does anyone know how these two things are related? If my headlights are on at night, they do NOT shut off under breaking, it's only when they are just DRLs.
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Old 07-14-2019, 04:34 AM   #2
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It may have to do with resistance between your new LED lights and the relay. You may have to add an inline resistor. The relay won’t get the correct feedback from your LED taillights because they use so much less power to operate. Maybe they are linked together?

Anyone else have input? I know this happens when people use LED turn signals without putting in resistors too. Then they blink 3 times faster than they should. Like when one of your lights is out.
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Old 07-14-2019, 05:00 AM   #3
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Also, on these cars, if you put LEDs in the brake lights without resistors the cruise control won't work. When you start the car the cruise system validates the brake light circuit or something and if not enough resistance is found it shuts down the cruise system altogether. Reason being it uses the resistance seen in the brake lights to know when to shut off the cruise control and if that isn't present it doesn't allow the cruise system to come on in the first place. Why they didn't just design it to turn off cruise control dependent upon whether the brake light switch at the pedal is open or closed is beyond me. I guess it is a a roundabout way of telling you you have a brake light bulb burned out.
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Old 07-14-2019, 06:01 AM   #4
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So I did install the load resistors across the stop lamp wire and ground. This puts them in parallel with the light bulb, but that's how the instructions said to install them. So... the resistance should be okay.

Edit: Doh! I made a stupid error and confused some wire colors! All is well now.

Last edited by blackgoat90; 07-14-2019 at 10:19 AM.
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