charging issues help please

[shockedmustang]

Thats where im confused the alternator will charge fine for a bit then just stop charging for no reason and this is the third alternator that im on. The ground I had in question is the one that runs from the motor to the body of the car im wondering if that is bad. But I did run another cable from the alternator's bracket to the batteries ground cause of the question but it still happened.

[CTScott]

Originally Posted by shockedmustang

Thats where im confused the alternator will charge fine for a bit then just stop charging for no reason and this is the third alternator that im on. The ground I had in question is the one that runs from the motor to the body of the car im wondering if that is bad. But I did run another cable from the alternator's bracket to the batteries ground cause of the question but it still happened.

That is very odd that three have behaved the same. The charging system on the Yaris is very simple, so it isn't like there is a feedback loop that is opening.

Another thing to check is where the positive lead from the alternator hits the positive battery terminal. It comes into one of the large connectors on the bottom of it. I have heard of a couple of people having that connector severely corroded.