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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.
Check the bulbs, check the fuse, check the flasher relay, in that order.
Bulbs burned out or fuse and or relay popped
Headlights - H4 Side repeaters - 10mm W5W Trunk - 10mm W5W Foglights - H1 Parking lights - W5W Indicators - P21W Taillights (stop lights) - P21/5W Taillights (indicators) - P21W Reversing lights - P21W Licence plate light - W5W Spoiler brake light - P21W from: (http://www.socaltercel.com/riko/Paseo%20&%20Cynos%20catalogue3%20-%20Exterior.pdf)
brake relay or sensor
Bad switch, bad relay, short to ground in the circuit.
Probably a blown fuse or bad relay.
To stop running the DRL daytime running lights in the 2005 Toyota Echo the headlight relay needs to be modified. The DRL module on the relay needs to be cut and relay inserted into the harness.
Most likely the relay responsible for signal has failed. But you need to start from the fuse box next to the steering wheel. Check if the fuse responsible for the lights is ok. If it's you need to remove and test the relay. if the lights come on but just do not flash you have a defective flasher relay. Replace it.
The brake lights and signal lights are tied together in the signal switch, also known as the "multifunction switch".
A malfunctioning brake light and flasher relay switch will cause the brake lights and flashers to stop working. The relay switch can be found below the dashboard on the drivers side of the passenger compartment.