I need a Headlight dimmer switch for my 75 Dart, however evrywhere that I have gone has tried to sell me a 3 prong switch but the original only has 2 prongs and a small circular area that meets up with a small round stub coming out of the connector.

Can anyone give me any ideas about where to find the correct one. I was able to push the one with 3 connectors in far enough to give me low beams but that is all.

Any help is appreciated.

All the dimmer switches are 3-terminal.
Sounds like your third terminal broke off and is stuck in the connector, and probably the reason your old switch quit working.
Pull the broken terminal out of the connector and the new 3-terminal switch should fit.

Craig,

Thanks for the info. I am going to get into that tonight and see about that. It makes perfect since.