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Alternator Issue?


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Hi! Since I changed my battery terminals, I got a charging problem. Battery gives 12.6v, but when I start the car, it drops to 11.9v. I don't know if I have damaged a wire, but I had to pull them to plug on battery (they are a little bit too short)

Today I changed the battery ground wire for a brand new 1awg cable, but it didn't make any difference.

I took the voltage at the alternator, same thing ; 11.9v when the car is running and if I un-plug my battery, the car stop.

I also tried to unplug the white/blue wire from its connector near the fuse box, and the voltage grow to 17volts

I don't know what this red connector do, but when I changed the terminals I've gutted it :


(not my engine bay, just a random picture for the net)

Help me please, I want to use my car!

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