Torque Converter lock up

[dayj1]

Originally Posted by 67Steven

so how does the TCC have a ground just hooked to the brake light feed?

The filament in the tail light bulb acts as a pull-down resistor to ground. That's why a resistor needs to be added into the circuit if/when you run LED tail lights (because an LED has no filament and does not allow current to flow backwards through it).