My cruise didn't work for years. No light, nothing. I tried a module that I got at the junkyard, and it didn't work. Finally a couple of years later, I found out there was a brake switch. Mine was out of adjustment. I adjusted it, and got a Cruise light. Still didn't work. Ended up being the module thingy under the hood that the cable attaches to. It was like $70-90 for a Delco one. Now I buy try to find them at the junkyard. That's expensive.
So: 1. Check the switch, then
2. Go to the junkyard and get one of the solenoid thingies, and try that. (Actually, get a couple just so you are sure you get one that works.)
Good Luck
Brian