Sorry that it's a problem that brought you here, but I'm glad you found us!
Have you checked to see if ProStart (I've never heard of them) has an online troubleshooting guide? That would be a good place to start, if only to skip through the typical troubleshooting script you'll have to run through if you get in contact with an actual human.
When you say that that after you hit the brake that the tail lights go out and don't work, is this only the running lights or do the brake lights not function either?
Welcome to NICO!
