You know the starter is going bad when you have a dragging starter.
A car failing to start is an indicator that a starter is going bad. A bad starter can also cause a screeching sound when the key is turned.
Could possibly a solenoid on the starter going bad. Could possibly a solenoid on the starter going bad. Could possibly a solenoid on the starter going bad.
Remove the starter and have it bench tested.
A way to tell is by the sound the motor makes. If it is winding slowly with no force it could be going out. If it skips or whines without action it is out.
Take it in!
Its going to be the same way you can tell if any other motor is going out. Parts start breaking what seems to be at the same time. Or maybe you can hear a knock or tapping.
One indication that the starter is going bad in your vehicle is if the vehicle won't start but the battery is full of life. When the starter is the reason, a very audible click will be heard.
you probably have a bind the burning smell is probably the wire going to your starter you need to find out what it is, try tightening the starter then replace if need be
Remove starter and bench test it for operation and current draw
Not sure if its the starter or the battery? Check the battery at a store. They can do a check on it for free. If its good then the starter could be bad. Bad starters don't work or they work intermittently. Usually just ehear a click and then when you retry it starts. That's the symptoms. Most places can also check the starter for you.