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My rear lights don't come on when i turn my headlights instead my 3rd brake light comes on

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Hi there,

Your rear brake bulb wiring is connected to the high stop light, but when your problem occurs, it usually means there is a short in one of the brake bulbs (or associated connectors).

Firstly, inspect the brakelight fuse (just in case the rear lights are on a separate circuit).

Secondly, check for blown brakelight bulbs (and replace if necessary).

Thirdly, remove the bulbs and ensure they are the correct type (i.e. the bulb contacts must match the bulb holder - usually double contacts). If you have the incorrect contacts type, this will cause a short also.

Hope this helps...

Scott

Posted on Nov 12, 2009

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Your front signals flash rapidly because your rear ones aren't working and that is normal and shows that a bulb in the circuit is out. At least that means the problem is not with the operation of the signal....good. Also your 3rd brake light works which shows the brake switch is working. Again...good.
Everything so far points towards your rear light clusters being at fault, although both at the same time is somewhat unusual.
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Have you recently had something changed on the vehicle, or inspection work done? Maybe wires/connectors/grounds etc have been damaged or disconnected/reconnected wrongly in that area.
Try running a live directly to the cluster to see if that makes anything work as it may show a circuit break as the problem.
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We can start with G100 located at the Left Front of the Engine Compartment on the left front body mount. See diagram below:


wyet_helps_24.gif Check out also G401 which is located in the chassis harness, mounted to the left rear Body mount. This ground point is shared by the rear lamps like the brakes, reverse, and rear signal lamps.
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