faulty wires
Bad bulbs can be the cause of your reverse lights not working on your 1999 Toyota Tacoma. A problem with the reverse switch or bad wires can also be the cause of your reverse lights not working.
Usually, there are two of them.
Apperently there are no fuses for the reverse light. First check the wiring that goes down the trunk. The wire tend to split due to the trunk going up and down.
could be the neutral saftey switch .
It only allows starting in park and neutral and it turns on the reverse lights.
It only allows starting in park and neutral, and runs the reverse lights.
It's most likely the reverse/neutral safety switch located on your transmission
There is a switch on the shifter or trans that turns on the lights when the vehicle is placed in reverse, it is out of adjustment or faulty. And don't forget the bulbs or fuses as a cause.
neutral safety switch on top of steering column under dash.
The neutral safety switch is what controls the reverse lights. It is located on the top of the transmission almost directly below the brake master cylinder.
try the neutral safety switch
Most likely it is. I have had several neutral safety switch issues before, and it sounds like what happened to me. If you put it in reverse do the reverse lights light up? If not that is also a safety switch problem.