You can find a wiring guide for truck brake lights on a Ford F150 by going to a gas station and picking up one of the auto books. You can also purchase one at any automotive store.
On a toyota tacoma 2003 SR5 when the tail lights are turned on the brake lights come on and when the tail lights are of the brake lights work just fine what could be the problem. If the truck has a trailer plug, inspect the plug and plug wiring for damage and corrosion.
the old wiring is probly shot cause its an old truck. you should bring it to a mechanic to get it fixed
it could be the brake light switch that usually contacts the break pedal when you depress the brake pedal. check that out first.
Assuming you're talking about a brake control valve, there is no wiring...
There is a short in the wiring or a corroded brake light receptacle.
Either a bad lamp or wiring fault.
Typically, there's a hot switch attached to the pedal which closes the circuit to the brake lights (or to the CECU board in a truck which uses CAN BUS communication).
3rd brake light or rear brake lights?
Those tail lights could be the brake lights you are seeing and that would be a faulty brake light switch or the brake light switch is out of adjustment.
need a wiring diagram for a 94 chev cab for the brake light switch
If there is a trailer wiring harness on the vehicle for towing unplug harness under drivers side rear tail light to eliminate the trailer wiring that's probably the issue then plug factory wires together
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.