When I turn key to on position the car tries to.

When I turn key to on position the car tries to start. I don't even have to turn the key all the way just turn it to the on position to car tries to start sometimes it'll start sometimes it won't when it doesn't start it starts to get some starts getting hot I smell electrical fire and I see smoke coming from underneath the hood in from the dash area is there something I'm unsure I'm thinking possibly mission switch but mission switch to very expensive and don't want to exchange if it's not the problem the battery seems good to starter seems good for remote start car starts just fine