The four pin has one pin that is ground one pin that will only have power when the lights are on and the other two will have power when the brakes are on. There is no single pin that ha power all the time unless one of the above is true.
If this doesn't help can you better describe the problem you are having? I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa