If you are using an aftermarket turn signal switch, my suggestion would be to get a new one. Most older turn signal switches aren't made for a use with brake lights, there are many newer ones that are. I believe LMC Truck has one and I have seen one on BlueOvalTruck Parts. Signal Stat has some good units available, but they are pricey, but extremely durable. I think the money you spent on the converter would be wiser spent on a new switch.
