If it were the gear position switch you couldn't start the engine without the clutch being pulled in.Welcome to the forum stevielinker.
If you know the light is good, then you are probably looking at the gear position switch. On the 1500 it's only used to light the neutral light and the OD light, unless you have an after-market gear indicator. If you don't. It's pretty easy to check if you have an ohm meter, but getting to the plug to check it isa bit more difficult, and replacing it is a bit of work as well and you'll need a front engine cover gasket. If you have more questions feel free to ask.