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Most Cruise control systems will turn off if your brake lights are out so you will know to check them.
Why did you use a relay for your lights and cruise control?
Did you have it hooked up this way before the change to LEDs and did it work?
To me it looks like when you press the brake the cruise control gets connected to the 12v so if you need it to have that 12v to be on then you have 87 and 87a reversed. If to function it needs to see ground and should not receive voltage from that side you may have killed your relay or cruse control.
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