The third light and brake works badly

BUENAS The third brake light of my BMW works badly to me and sometimes does not work the and disassembled but I do not find the failure you could tell me where I can buy it or that can be done. Thank you

Check all connections, look at the cables well, if you want to buy a new question in spare stores see k tal

You have to check the continuity of the current in the connector at the time of braking if the continuity is good in the sole if the problem is the blister the light itself, it is not complicated or expensive, if the current in the connector is not well proves with a direct land if everything is normalized. normal brake and chassis land, it is important that the earth be of chassis so as not to overheat the system.