Charging issues when cold outside 07 Yaris.

[Zombiesrock]

Thanks for the help. I had come across that thread too but was not certain if it was the same issue because it only happens in severe cold. It goes away when it’s warmer. However, I am still able to return my aftermarket alternator to Rock Auto for store credit. After doing research my best bet might be to use it towards a manufactured Denso OE one? Have any of you used that brand before on these?