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2018 Mustang gt w/Performance Pack 1
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Discussion Starter · #1 ·
I just purchased my 2018 GT PP1. I never noticed the light on the rear lower diffuser. It’s always on whenever I turn on my lights. I thought it only should be on when I apply the brake or when I go in reverse. I’m not sure if I like it. I drove a challenger for the last ten years so I never noticed that light. Is there a mod or something I can do? I think it throws off the look of the rear of the vehicle.
 

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Those are just reflectors on the rear lower diffuser sides. They have no bulbs. Do you mean the lower quarter panel marker lights on the sides? Unless someone did a mod to the car before you got it.
Post a pic please.

The clear center light in the lower diffuser is your reverse light. There may be a short in it or your reverse light switch/neutral safety switch.
Also, I noticed that there's a 4th LED brake light kit available for the lower diffuser in the center. Perhaps someone added that and wired it to be a running light instead of a brake light or maybe there's a short that makes it stay on all the time.
 

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Diode Dynamics makes an LED replacement bulb for the reverse light that adds a brake light/red running light. I bought one and it works fantastically. You do need to wire it into the car wiring correctly obviously.
 
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