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Fog Light/Tail Light interference

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Old Dec 23, 2022 | 07:05 AM
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Default Fog Light/Tail Light interference

Hi All,I have a wiring issue that I am hoping maybe others have tackled with success.

When I put on my right turn signal - the outer right turn signal blinks the inner light is solid. When brakes are applied inner light - lights both brake and turn signal sections of the bulb. When fog lights are on it switches the symptom to the outside right rear light. So depending on if the fog lights are on or off determines which tail light functions properly.

I replaced all the turn signal bulbs and tail light bulbs and put in a new turn signal relay. I was thinking of replacing the fog lights, but it seems switch related. Any thoughts or experiences?

Vehicle is a 1990

Thank you all and Merry Christmas!
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Old Dec 23, 2022 | 09:57 AM
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First thing I would do is check all of the grounds related to these lights. Sometimes bad grounds will cause feedback onto other circuits.
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Old Dec 23, 2022 | 09:59 AM
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Did you have this issue before you replaced all those bulbs?
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Old Dec 23, 2022 | 04:31 PM
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Yes, I changed all the bulbs to ensure that all the sockets had the correct bulbs - hoping that would fix it.
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Old Dec 23, 2022 | 04:33 PM
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Negative on forgetting to mention. US spec. Correct when applying the turn signal both sections of the filament light. One light blinks correctly with the correct filament lighting. The other is solid on both filaments. When fog lights are turned on - the effected light switches to the inboard or outboard side.
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Old Dec 23, 2022 | 08:06 PM
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Thanks I will research the rear ground straps. Much appreciated!
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