I have an old GM controller that has no reverse leads. Can they be installed, or does the controller have to be reprogrammed?
Which model controller do you have and how old is it?
Have you removed the casing and looked for obvious unused connector points on the board?
(Some pictures may also be very useful).
If you can give as much information as possible, you may get a quicker response from someone who may know the answer.
Hopefully you will receive a definitive answer soon, but it may not be the one you're hoping for.
Alan