Erik sund

I just open the box of my old thunder shot from mid 90s. I remember it was broken when I last left it, but now I really want to get it going. I remember it to be a great fun car. I have opened it to try to troubleshoot but can’t find anything. the engines are working when I power them. But from the controller it’s totally dead. Totally. any ideas? Where to start? the controllers antenna is missing, but I doubt that’s the main problem. thanx! I would really really want to get it to work