Question about 1999 Chevrolet Silverado 1500

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My turn signal doesn't work when I apply the brakes on the outside, on the inside when I apply the brakes the turn signal's both are faintly visible??

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Hi,
I'm going to take a shot and ask if the truck has a trailer electrical connector setup... because if so, I'm suspecting that there is a situation where some wires are coming into contact that shouldn't.
I'm just suggesting that you give a good visual inspection to this and hope it's a quick fix for you.
Good luck!

Posted on Sep 23, 2009

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There is a bad ground in the tail light circuit. the ground wire ends up near the spare tire bracket on the frame. black wire.

Posted on Sep 23, 2009

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Posted on Jan 02, 2017

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1 Answer

97 Oldsmobile bravada my right brake light won't


Sounds like a short in the socket or a bad ground.
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check for power and ground. One should be at battery voltage and the other ground. Somet5imes ground can't handle the current from the bulb so try to make a connection to ground. I try to either use the fuel tank or run a wire from the battery.
Second reason the turn signal switch can go bad and keep the battery voltage from reaching the bulb. I will also assume you checked the bulb on the other side that you know works fine. I use electrical contact cleaner inside turn signal switch. Move the lever
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2009 Impala rear lights not working


Turn Signal Lamps
The LT T/SIG and RT T/SIG fuses located in the underhood fuse block supplies battery positive voltage to the body control module (BCM) for turn signal and hazard lamp operation. When the turn signal switch is place in either the LEFT or RIGHT position, ground from G202 is applied through the turn signal switch signal circuit to the BCM indicating the turn signal request. In response to this signal, the BCM applies a pulsating voltage to the front and rear turn signal lamps supply voltage circuits cycling the lamps ON and OFF. The BCM also sends a message via GMLAN to the instrument panel cluster (IPC) to cycle the turn signal indicator ON and OFF depending on the position of the turn signal switch.
Ground for the turn signal lamps is supplied as follows:
• G101 provides ground for the left front turn signal lamp
• G100 provides ground for the right front turn signal lamp
• G302 provides ground for the left and right rear turn signal lamps

The LT T/SIG and RT T/SIG fuses located in the underhood fuse block are also used by the body control module (BCM) for stop lamp operation.
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The body control module (BCM) provides both, a 5-volt reference voltage and low reference to the brake pedal position sensor. The position sensor provides an analog voltage signal back to the BCM that will increase as the brake pedal is applied. When the brake pedal is applied, the BCM will then apply battery voltage to the left and right stop lamp supply voltage circuits and the center high mounted stop lamp (CHMSL) supply voltage circuit illuminating the stop lamps. At the same time the BCM signals the transmission control module (TCM) and the engine control module (ECM) that the brakes are applied. Ground for all stop lamps is provided at G302.
The stop lamps on this vehicle will not illuminate unless the ignition is in the accessory, run, or crank positions. When the ignition is in the OFF position the stop lamps will not illuminate when the brake pedal is applied.

Did you check the fuse's. ? Wouldn't think it's a ground because right an left tail lamp Assembly's use same ground ! Did you check for B+ voltage at the bulb. with a volt meter ? Power is supplied by the BCM . Could be the tail lamp assembly

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Press and hold the brake pedal while pushing on the harzard switch and let me know if the brake lights come on.

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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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