Question about 2001 Chevrolet Astro

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Top break light works, right and left break light do not turn signals work

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Colin Stickland

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Fit new bulbs ,how simple is that ??

Posted on Nov 17, 2008

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1994 Toyota t100 left break light will not come on when the break peddle is pushed


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Left bleaker and break light not working. Turn signal works bleaks faster than right side.


Has the vehicle been in an accident on the left rear side. First check the bulb to be sure it is not defective, trade it out with the side that works properly to test. If the bulb works well then My thought are you may have a shorted wire. The turn signal flasher works by heat build up within the flasher the heat is caused by the load of the bulbs, the load heats the metal spring causing it to open the circuit then as quickly as it cools down the circuit closes again lighting the bulbs.
There is also a possibility of a defect in the turn signal mechanism on the steering column. The turn signal switch on many models does three different things on many models that use the same bulb element / or bulb for brake and turn on rear of vehicle. It controls the circuit for brake light by sending power both left and right side rear when turn signal is in neutral position then when turn signal is in left turn the switch cancels brake light power to left side rear and supplies flasher power to left side while maintaining brake light supply to the right side rear, and so on opposite when the right turn is chosen on turn signal switch. The turn signal indicators on the dash normally run off the same circuit as front turn signal bulb only which is also controlled by turn signal switch. Front has turn signals but no brake light.
I think there is an additional load on the left side rear turn circuit and it could be either a wire that is shorted or the turn signal switch if the same bulb element is used for both functions.
Often times if trailer lighting is connected the flasher will also blink a little faster because of the extra load of additional bulbs.

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I have a 1990 GMC Sierra K2500 and cannot for the life of me figure out why I cannot get my break lights to work as well as my turn signals. Fuses are fine. The break lights are stuck on, and the turn...


The brake lights work from a switch at the top of the brake pedal under the dash. They can get out of adjustment or break which results in a situation as if the brake pedal is depressed all the time. Turn signals only work with the ignition on. The switch is just a device that allows the current to either the left or right lights so if the lights are not working it will be either the switch contacts or the flasher can

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1 Answer

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Without being there to actually do some checking, I'd take a look at the signal switch itself. (In the top of the column) First though, check the bulbs, as I have seen (but rarely) a filament in a bulb break and re-connect itself to the other leg of the circuit.

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Replace the turn signal switch. Bad contact inside causing a crossing of the circuits. When the turn signal is applied it should open the brake light circuit allowing for just the signal to work. Doesn't sound like the switch is doing it's job.

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sounds like a turn signal switch on the column

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I had the same problem with my 2001. I found it was the multi function switch. Better known as your turn signal switch. I found that the hazard switch portion of it had shorted. replacement is fairly easy, aftermarket part is available, much cheaper than GM.

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