Rear warning light

I. been having this light on for the past couple months and can't find the problem. The light turns on every time I step the brakes and it'll stay on until I turn the car off. I replaced the little green box with a junk-yard one and it didnt fix the problem. All my lights work perfectly. I must of checked them at least 10 times already but cant find the problem. I even sanded the inside of the sockets and replaced all the bulbs.

ohm out the circuits. the box works by checking the amount of amps flowing on the wires. if it's low, it turns on the dash light. could be caused by corrosion on a connector anywhere from one post of the battery to the other. could happen if you have the wrong bulbs too.

Do you have normal bulbs or LEDs?