The brake lights in your 1983 Nissan pickup truck are controlled by the brake light relay switch. When the brake light relay switch malfunctions the brake lights will stop working.
The lights need to be taken out with a screwdriver Phillips usualy
check your fusible link, its connected to your positive battery cable,check for burnt marks or it might be swollen.
Because you have bad lights.
The Switch may be bad. Check the bulbs for the parking lights. Check the fuses / relays for the parking lights.
how do you change the tail lights on a 1996 Nissan pick up?
needle might be cracked
parking brake, push it down a touch
Use a volt-meter to measure the voltages and see what you are getting. You might have a couple of broken wires.
short to ground or a blown fuse