Turn signal not working

Tiny
ED ADAMS
  • MEMBER
  • 2007 CHEVROLET SILVERADO
  • 100,000,000 MILES
Right front turn signal not working, rear okay. Changed lower rear socket. Grounds okay. No power at harness plug. Also, hazard does not flash. All others okay.
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Saturday, December 22nd, 2018 AT 11:16 AM

32 Replies

Tiny
KEN
  • ADMIN
Hello,

It sounds like the BCM might be bad, but to be sure let's check the fuses that run the system. Here is a guide to help check for power at the fuses and the blinker wiring diagrams below so you can see how it works and the BCM location as well:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Monday, December 24th, 2018 AT 1:33 PM
Tiny
FOXTECH
  • MEMBER
  • 2007 CHEVROLET SILVERADO
  • 8.1L
  • V8
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
I have no left turn signal. The trailer works right and left. Right signal on trailer works perfect. Left signal on trailer flashes fast like when you have burnt bulb. Problem is no left turn signal on truck front or back. Replaced fuse with new one was not burnt. Bought and replaced box for all wiring at back of truck still no turn signal checked ground have good ground. Have no power on block for left side or wiring harness. Have power on right side, in block and in wire harness were you plug in lights.
Any suggestions?
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Sunday, October 25th, 2020 AT 12:01 PM (Merged)
Tiny
JDL
  • EXPERT
Did you check for voltage at left turn fuse, everything turned on? The circled fuse gets voltage from flasher module. If no voltage, could be flasher module problem or wiring to the fuse?
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Sunday, October 25th, 2020 AT 12:01 PM (Merged)
Tiny
FOXTECH
  • MEMBER
Is there a certain voltage?
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Sunday, October 25th, 2020 AT 12:02 PM (Merged)
Tiny
JDL
  • EXPERT
Any voltage at all? With key on, engine off, what is voltage reading across battery posts? The reading should be close to the same at the fuse. Generally around 12 volts, maybe a little less if engine isn't running.

Compare voltage at other turn fuses, the ones that work.
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Sunday, October 25th, 2020 AT 12:02 PM (Merged)
Tiny
FOXTECH
  • MEMBER
Ok no power so. I guess I'll try the relay out of my 2003 silverado till I can get a new one
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Sunday, October 25th, 2020 AT 12:02 PM (Merged)
Tiny
JDL
  • EXPERT
Yeah, a flasher module, if the same.
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Sunday, October 25th, 2020 AT 12:02 PM (Merged)
Tiny
FOXTECH
  • MEMBER
2003 - 2007 classic will fit most parts. It worked all working. Thanks
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Sunday, October 25th, 2020 AT 12:02 PM (Merged)
Tiny
JDL
  • EXPERT
Glad you got it going your way.
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Sunday, October 25th, 2020 AT 12:02 PM (Merged)
Tiny
CARLOS PALACIOS
  • MEMBER
  • 2007 CHEVROLET SILVERADO
  • V8
  • 4WD
  • 30 MILES
When I put my turn signal and step on the brake it stops working.
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Sunday, October 25th, 2020 AT 12:02 PM (Merged)
Tiny
MHPAUTOS
  • EXPERT
Sounds as if you have a short across the brake and indicator light, do you have a trailer plug fitted? If so make sure all wires in the back of the plug are insulated and free from rust and contamination that my case a short. If no plug, pull the globes from the brake lights and see if the indicators still stop with your foot on the brake, if yes, replace one globe and re test, if fault returns you know which side to start looking for short.
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Sunday, October 25th, 2020 AT 12:02 PM (Merged)
Tiny
NOAH VENUS
  • MEMBER
  • 2005 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 208,000 MILES
I just got the truck and when I got it the right front blinker was not working (it will turn on but not blink) and my right low beam was not working. I got the truck home and replaced the bulbs and when I replaced the blinker it still did not work. When I replaced the bulb on the right side low beam my left side low beam stopped working. All other lights work even high beams and all other blinkers work as should. I am getting power everywhere but the sockets for these bulbs appear to maybe be grounding out but I cannot find where. The bulbs in these sockets are new and work when I put them on a different socket. Any input is appreciated.
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Sunday, October 25th, 2020 AT 12:02 PM (Merged)
Tiny
KEN
  • ADMIN
Hello.

It sounds like you have a wiring problem or the BCM is bad and needs to be replaced but to be sure lets check all fuses for the truck none can be out.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Next you need to check the wiring for the system. here is a guide and the wiring diagrams along with the BCM and fuse locations:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please let us know what happens. If it is the BCM you may need to have it programmed if you cannot find a used one.

Cheers, Ken
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Sunday, October 25th, 2020 AT 12:02 PM (Merged)
Tiny
NOAH VENUS
  • MEMBER
I checked all the fuses related to my lighting system and they were good. Should I check all of them even if unrelated to lighting? I hooked the scanner to my truck today at work and it threw a code on the BCM but it was not anything to do with lighting and I cleared the code to see if it returns.
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Sunday, October 25th, 2020 AT 12:02 PM (Merged)
Tiny
KEN
  • ADMIN
Yes, check all fuses. Also, check the wiring continuity and if everything checks out I would replace the BCM.
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Sunday, October 25th, 2020 AT 12:02 PM (Merged)
Tiny
JOHN FULLER
  • MEMBER
  • 2005 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 86,000 MILES
My left turn signal works properly. When I use my right turn signal, it appears that my flashers come on or all 4 corners flash as well as my inside indicators. I have replaced the turn signal switch. Any ideas as to the problem or fix?
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Sunday, October 25th, 2020 AT 12:02 PM (Merged)
Tiny
JDL
  • EXPERT
Hello,

It sounds like the flasher module has gone out but to be sure here is the blinker wiring diagrams and a guide to help check the power and ground circuits with the location of the flasher module below.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Sunday, October 25th, 2020 AT 12:02 PM (Merged)
Tiny
BROWNN
  • MEMBER
Thanks for this post I had this problem and had to get a new flasher module cost me $53.00 I love this site.
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Sunday, October 25th, 2020 AT 12:02 PM (Merged)
Tiny
TREMBLAY
  • MEMBER
  • 2004 CHEVROLET SILVERADO
  • 114,000 MILES
I have a factory round trailer plug and have no turn signals coming from the plug. I have checked all fuses in the cab and under the hood.I also checked for power at the wires in back of the plug, no power there. I have parking lights and not sure about brake lights. What else can I check? It's a 2004 Silverado 2500HD with a 6.0L gas.
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Sunday, October 25th, 2020 AT 12:02 PM (Merged)
Tiny
DRCRANKNWRENCH
  • EXPERT
I just wanted to provide you the wiring diagrams so you can check wires and make sure you got the correct fuses. The reason I say that is that the wiring layout for the triler lights on this truck are confusing and use there own circuit fuses as well as some of the trucks light system fuses.
The first diagram shows the, "STUD #!" Fuse which is a 40 Amp fuse. The second diagram is harder to follow wires, 1 to the Trailer fuse 15 Amp, wire7 to Left Trailer turn signal fuse 10 Amp, Wire 8 to right Trilaer Turn signal fuse 10 Amp and wire 11 to the under hood fuse/relay box to the Left turn signal 10 Amp.
Then back in the cab at the Light control box in the fuse box under dash, there is a main fuse for the Flash Unit that is 25 Amps.

Otherwise follow turn signal wires for coninutiy with a multi-meter up to the fuse box and check the connector and terminals at the fuse box.

Let me know if you have any questions.
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Sunday, October 25th, 2020 AT 12:02 PM (Merged)

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