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2012 mustang side marker lights not working.

Old Apr 7, 2026 | 04:22 AM
  #1  
ElectroFrFx's Avatar
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2012 mustang side marker lights not working.

Got some new sidemarker lights from Auto Addict. Did the proper installation in the rear lights but haven’t done the front but my stock and new lights don’t light up at all even prior to installing the new ones. Tried switching the #22 fuse in the passenger kick panel but no luck. Anyone know any possible solutions? If someone has a diagram of where the wiring is located as well for the front and rears id appreciate it.
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Old Apr 7, 2026 | 11:28 AM
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Led Lights on Fords Can Do Some Strange Things.

If Your Lights Worked Before The Change Then The Issue Is Either a Defective New Lamp or All Four Need To Be Hooked Up To Work Properly. I Would Start By Plugging Stock Lamps Back In And If They Work You Don't have a Power Supply Issue. If They Don't Function Then You Should Troubleshoot With Stock Lamps Before Preceeding. Let us Know What Happens With Stock Lamps.

KC
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Old Apr 8, 2026 | 12:42 PM
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ElectroFrFx's Avatar
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Originally Posted by 05stangkc
Led Lights on Fords Can Do Some Strange Things.

If Your Lights Worked Before The Change Then The Issue Is Either a Defective New Lamp or All Four Need To Be Hooked Up To Work Properly. I Would Start By Plugging Stock Lamps Back In And If They Work You Don't have a Power Supply Issue. If They Don't Function Then You Should Troubleshoot With Stock Lamps Before Preceeding. Let us Know What Happens With Stock Lamps.

KC
Found out the reason my stock ones didnt work in the front was due to the bulbs missing, tried them and it work. So only issue is my rear side markers still dont work so im assuming it has to do with the wiring in the trunk. Anyone know where the wirings located?
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Old Apr 8, 2026 | 01:40 PM
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05stangkc's Avatar
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From: Visalia Ca.
Free Shop Manual PDF'S For Your 2012

https://charm.li/Ford/2012/Mustang%2...d%20Diagnosis/

Tail Light Section

https://charm.li/Ford/2012/Mustang%2...s/Tail%20Lamp/

KC
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