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Try disconnecting the new headlamp housing and see what that does. These newer cars are very critical about their electrical wiring. I have heard of one fellow whom put in the wrong bulb for a brake lamp which made his transmission act up until he put the proper bulb in the socket.
If removing the headlamp housing fixes the brake lamps then check and see about getting the proper lamp housing or comparing wiring between the two units to find the culprit in the lamp circuit.
If removing the headlamp housing fixes the brake lamps then check and see about getting the proper lamp housing or comparing wiring between the two units to find the culprit in the lamp circuit.
