Charging system issue

Hi all-
I need some help with a strange issue in my charging system. About 6 months ago, my battery light started flickering. After checking all the usual suspects, I found it to be a bad connection on one of the spades in the pigtail that connects to the rear of the alternator. I soldered a new pig tail in and it held for a while but didn't last too long. I didn't realize at the time that the positive battery cable is all one piece with the pig tail and all made together. I ended up buying a new positive battery cable from my local dealership and the problem was fixed. No issues at all for 6 months or so.

Last night, as I'm driving home from work, the battery light pops on and is lit continuously. No flickering or anything. I pull over and pop the hood and push on the pig tail connector and the alternator starts charging again. Now, this is a brand new, factory cable from Toyota and I'm having the same problem as earlier. There's no way two pig tails go bad like that. Strangely, I unplugged the connector and checked the wires with my meter and I'm getting resistance on the yellow wire in the pig tail-the exact same wire I had resistance in on the old one. I've had the alternator checked at a reputable shop and the guy said there's nothing wrong with it. What do you guys think? Is there a way to check the voltage regulator on the alternator? Why am I getting resistance on the yellow wire? Please help because I'm at a loss.

 

Is this the stud or the plug? If it is the stud, maybe make sure the stud itself is tight in the casing.

 

It's the plug.

 

This is the electrical system guru here:

BamaToy1997

Send him a PM and explain what is going on.