If there was changes done to the wiring, it may be a ground wire especially when the light is not that bright even if you do not have the brake pedal pressed. You may have to inspect the wiring for this. Most likely this may be the wire that sends power to the tail lights when you have the headlight on. Inspect the relays under the hood for physical damages the ground connection may be just under the box for the relays.
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Hi, your relay must be shorted. Look for a stop light relay and pull it out. See if there is a similar relay you can borrow to push back in and verify that replacing the relay will solve the problem.
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