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If car is an automatic you have a missadjusted or failed mutifunction switch on side of trans, if a manual trans, it is a failed reverse light switch which is on trans.
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Check Brake Light Bulbs: All cars have three brake light bulbs that create the brake light illumination affect. If the lower two bulbs fail no lower brake light operation will occur. I know what you're thinking, you might say two brake lights at once? But in reality one brake light went out at a time and you did not notice. People only tend to notice something when they almost run into the back of your car to help persuade them to inform you the brake lights aren't working. Remove either of the brake light bulbs to confirm the bulb is ok or burned. After the bulb has been removed inspect the filament and replace if failed. If the brake light bulbs are ok continue to the next step.
Checking the Turn Signal Switch: Most American cars are designed to have the brake light switch wiring intergraded into the turn signal switch. Because the brake light bulb and the turn signal bulb are one and the same the turn signal switch interrupts the brake light circuit and installs the blinker signal circuit when the turn signal switch is activated. If this switch fails it will not allow the brake light signal through to the brake light wiring. To test for this condition a car repair manual is needed to test incoming and outgoing electrical current. If brake light switch power is present at the turn signal switch but not at any outgoing brake light wires the turn signal switch has probably failed.
There is not any left or right reverse Light switch. It is only one switch for reversing light and it is fitted on the Transmission. If you do have the one working and the other not,first check the bulb if is ok,if not change it. If the bulbs are ok, check for any broken wiring.
Connect a Test Light between the ground wire on the light socket (bulb holder) and somewhere on the body (a clean/bare metal surface) and then put the transmission in reverse.
If the Test Light lights up, you have a bad ground (broken wire, bad/corroded connection). If it doesn't then use a Multimeter to check for power on the Positive side of the Socket, No or Low voltage means a bad wire. Battery voltage is generally 12.45 (without the engine running) and 14.5 (with the engine running) So if you're getting less than that (by more than .3) you have a poor connection or damaged wire
definately check the fuse, if it is good then you need to check the condition of ground in the light bulb sockets, if good then you will have to check the reverse light switch
Could you take out a bulb and with a testlight/probe check that you do in fact have power to that circuit .Also check that they are the correct bulb for that application I have seen people put indicator bulbs in where therse supposed to be a double filament bulb.Does the base of the bulbs lead contacts line up with the two steel terminals inside the plug?
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