1989 Other Suzuki Models Won't start

When my husband first hooked up a trickle charger, he mixed up the terminals? Since then the car won't start. Battery charged successfully. Fuel flows out of carburetor, spark plugs sparked. I understand that mixing up the terminals can cause an electrical problem of some sort. Is there something I can check to determine if that is the problem?

I should say that this is the first time the car has been started since December but I've done this every winter and never had a problem before.

Thanks, Pam