Why would the tail light fuse blow when you turn on park lights a 1993 Pontiac Sunbird?

The tail light fuse would blow when you turn on park lights on a 1993 Pontiac Sunbird most likely because there is a short circuit in the wiring between the park light switch and the tail lights. This could be due to a damaged or frayed wire, or a faulty connection. It's also possible that the park light switch itself is faulty. To diagnose the problem, you will need to inspect the wiring and connections between the park light switch and the tail lights, and test the park light switch.