Turn signal turns off cruise control

[awhoy]

Yesterday was the first time using the cruise control on my 05 GT in probably more than a year. Every time I signal to change lanes cruise control stops and the car decelerates.
Seems like my turn signals also acts as the "Cancel" button. I am quite sure the cruise control worked properly the last time I used it.

Over the last year I had some electrical mods - high beam DRL, new after market head unit and added OEM heated seats. Not sure if any of these mods caused this, wondering if any of you experienced this problem.

[Mazda3X2]

We had this same problem after installing a trailer hitch wiring adapter in our 08 GT. Seems the LED tail lights messed something up with their adapter. They had to take it out and install things a different way for it all to come together. I know you didn't mention installing a trailer hitch or anything but I thought I would add this information just incase.

Good luck.

[awhoy]

Actually, I do have a trailer hitch and wiring harness on my car. Last year I replaced the tail lights with OEM LED ones. I'll remove the hitch wiring harness when I get chance. Thanks Mazda3x2.

[Noisy Crow]

Probably tapped the wrong wire(s) for the brake lights for the trailer, or you need to add a diode. The cruise control kicks out when you press the brake pedal.... if the trailer has the brake and signal lights on the same bulb a reversed wire or two could cause weird things to happen....