OK, what brand cap? What is the Mouser part number?
If the line is broken, does it break into minus signs?
Yes, the data sheets will be helpful, also if you get a transistor tester, it may help you to identify the pinouts.
The most common pinout for any American brand TO-92 is EBC. I always assume this is the case, but a quick check with a meter will verify the base and the type (NPN or PNP).