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2018 gmc savana no right brake/turn signal. please help me fix it.

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Old Jun 23, 2025 | 05:42 PM
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Default 2018 gmc savana no right brake/turn signal. please help me fix it.

hi. this is my first post. I need some expert help. My passenger side brake light and turn signal lights don't work. I checked the bulbs and they are all fine. I cant find the flashers and I cant seem to locate any blown fuses. please help.
some clues might be that the passenger side flasher used to flash a lot more rapidly than the driver side. then one day, the driver side started flashing rapidly too....thats about when someone told me the passenger brake light was out. the bulbs are normal incandescent type. Thanks for any help out there.
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Old Jun 23, 2025 | 08:05 PM
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You need to replace the bad bulbs. You have more than one bad one.
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Old Jun 23, 2025 | 10:43 PM
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Originally Posted by GCElectric
hi. this is my first post. I need some expert help. My passenger side brake light and turn signal lights don't work. I checked the bulbs and they are all fine. I cant find the flashers and I cant seem to locate any blown fuses. please help.
some clues might be that the passenger side flasher used to flash a lot more rapidly than the driver side. then one day, the driver side started flashing rapidly too....thats about when someone told me the passenger brake light was out. the bulbs are normal incandescent type. Thanks for any help out there.
Are you checking front and rear bulbs?

How did you test all of the bulbs?
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Old Jun 24, 2025 | 07:44 AM
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Originally Posted by CathedralCub
Are you checking front and rear bulbs?

How did you test all of the bulbs?
Just the blubs that dont work... I looked at them. Then I tested for voltage on the sockets and there was none.
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Old Jun 24, 2025 | 08:26 PM
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So you need sockets?
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Old Jun 24, 2025 | 11:32 PM
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Originally Posted by CathedralCub
Are you checking front and rear bulbs?

How did you test all of the bulbs?
Originally Posted by GCElectric
Just the blubs that dont work... I looked at them. Then I tested for voltage on the sockets and there was none.
​​​​​​​
Looking at them isn't a great test. Could you try them in a socket that works?

How did you test for voltage on the sockets?
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Old Jun 25, 2025 | 06:24 PM
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ok So i guess I need to take the tail lights back apart and prove the bulbs work, then we can talk about it, and maybe i will find something i overlooked. i would be stoked to find both double filament bulbs bulbs are actually bad.and thats all it is.
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Old Jun 25, 2025 | 06:30 PM
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they may be only single filament come to think of it and just have 2 springs inside, so its hopeful.
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Old Jun 25, 2025 | 11:30 PM
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If it has two filaments inside then it is a double filament.

How did you test for voltage on the sockets?
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Old Jun 27, 2025 | 06:38 PM
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i did the test. i took the bulbs out and tested each filament with a bench power supply. one filament was failed. it looked perfect on a visual test. you guys nailed it. thank you for all your help. cheers.
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