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102 Posts
Definately the back light, I had the same thing when the bulb holder was slightly cracked and not holding the bulb properly.

The brake light works even when the ignition is off, the fault causes the brake light circuit to power the main lights, then if the lights are switched on they'll power everything on the main switched 12V circuit!

The cruise and turbo won't work because the main lights are powering the brake light circuit and the ECU thinks you're pressing the brake pedal.

I bet you keep the headlights on all the time?(same as me) otherwise you wouldn't get these symptoms.

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