The first thing I'd do is try your charger in another car. If it doesn't work then, you know the problem isn't with the car. It may be a matter of using pliers to make sure the actual connections from the charger to the lighter socket are reasonably tight...
Jack Travis, E-Series Acting President
1989 Ford Fairmont Ghia turbo/GL replica (underway)
1994 Eunos 800M
1990 Ford Laser S