Originally Posted by cadmanof50s
What are you using PIN D for? Do you have a manual switch for towing? That is typically what this type of circuitry is used for.
The trans was pulled out of a '63 C-10, which I believe was used for towing.
There is a manual switch attached to the external wiring. Since I have this in my '63 Chevy II, I will not be towing with it.