#Brake light switch diagram driver#

If the connections are good but the switch is not functioning properly it may need to be replaced. Under such circumstances you should check the wiring harness connections at the turn signal switch on the steering column. The internal contacts in the turn signal switch would be functioning properly in turns, but failing to make the connection between the stop lamp switch output and the rear tail light filaments when the turn signal switch is in the neutral position.

If you find that the turn signals on the rear of the car both function correctly, but the brake lights do not, you likely have a problem inside the turn signal switch. When the turn signal is canceled after making the turn, the turn signal flasher output voltage is disconnected and the connection is reestablished with the brake light switch output.

#Brake light switch diagram driver#

In this way a driver following the Corvair will see both a continuous brake light on one side and a flashing turn signal on the other side, indicating that the car is both slowing down and turning. This causes the selected turn signal to flash, while the brake light on the opposite side remains connected to the stop lamp switch. The same rear brake light filament is temporarily reconnected to the output of the turn signal flasher (located in the fuse block). When the turn signal (left or right) is activated, the turn signal switch temporarily disconnects the rear tail light on the chosen side from the brake light switch as a power source. When the turn signal switch is in the neutral position (turn signals off), the voltage applied from the stop lamp switch should pass straight through the turn signal switch and on to the taillights. If you determine that the stop lamp switch does have voltage and is passing it through when the brake pedal is depressed, the next place to check is the turn signal switch. If you can measure voltage going into the stop lamp switch, do you also measure voltage at the other terminal coming from the stop lamp switch when you depress the brake pedal? That power should be available to the stop lamp switch at all times and is not controlled by the ignition key position. If you follow the schematic wiring diagram and trace the wire from the top of the stop lamp switch you will see that the stop lamp switch receives power from a connection to the main light switch. If the turn signals at the rear are functioning, but the brake lights failed to come on when you step on the brake pedal, you need to check the output voltage from the brake lamp switch at the brake pedal (while depressing the pedal). Do your turn signals function properly at the rear of your car? This means that the circuit is good all the way from the turn signal switch at the steering column to the taillights. If the turn signals on the rear lights are functioning, then you know that the wiring and bulbs are functional for the brake lights as well. This is also true with the wiring associated with those bulbs. The same bulb filaments (1157 bulbs) in the rear taillights that provide turn signals also provide brake lights. If you trace the wire exiting the stop lamp switch you will see that it enters the turn signal switch. To the right of the fuse block you will see a representation of the turn signal switch, and above that the stop lamp switch. Choose one of the schematic diagrams below and left-click on it (two times for maximum enlargement) so that you can see a close-up of the interior wiring.