I drive a 1990 Nissan Stanza. It’s a beater for sure. Inspite of its decrepid status, I’d like to keep it running. Yesterday, on the way to work, it started shaking violently, the battery light came on and then the car shut off. If I try to jump it, it starts right up, but as soon as the cables come of it dies. I replaced the battery and the alternator less than a month ago. I do have some mechanical knowledge, but not enough to know where to even attempt to start fixing this, and I can’t afford a mechanic at the moment. Any ideas or tips on what the problem may be and how to go about trying to fix it?