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2018 Mustang Electrical issues

codesx100

Well-Known Member
Joined
Jan 15, 2018
Threads
2
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Location
NJ
Vehicle(s)
2018 Mustang
Need some help. This past weekend i did some mods pp2 front splitter and rtr upper (with lights) and lower grill. Once i got everything on the car i took it for a 10 minute drive parked and got out of the car. I noticed when I went to lock it using the key fob, the horn did not sound. I got back into the car and tried turning the car on but once I did everything tried to power on but then nothing started and all the electronics dropped out entirely.

I noticed if i leave the car alone for a bit the exterior lights flicker, and the interior lights will come on for a few seconds but then everything dies out. I did a simple battery tester today and it seems to have 12volts but anytime I put my foot on the gas petal and try the start button all the little power left drops. I tried disconnecting the rtr lights to see if that was the issue but the problem still exists.

Any suggestions?
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