u/Adorable-Alfalfa-975

I have a 72v 80a generic style non-programmable controller. Is there a way to turn on regen on this? I've tried bridging the EBS pin with ground and I get a 5V reading but nothing seems to happen. I've tried while holding and not holding the brakes. In my display, which is a UKC1, in the advanced settings there is no setting for regen. I'm wondering if someone got something like this to work before. Thanks.