Ask a Mechanic Online and Get Answers to Your Car Questions
Hello, my name is***** you tell me the colors of the wires and their voltage reading with the key on?
Thanks Keith. Isn't there a black with red stripe?
What color is the large single wire?
It sounds like the readings are fine. You may have a defective alternator.
Have you checked the alt fuse? If it is fine then it may be the control circuit on the green wire.
On the left side of the engine compartment there is a fuseible link box. This is actually a link. One easy way to check is to remove the large wire from the alternator and see if it has power when it is disconnected.
Then the fuse is fine. Does the charge change at all when putting a load on it or does it remain the same?
From everything you have told me it should be charging fine unless the engine ground is loose or corroded. Has this been checked also?
Thank you. I am at a loss as everything seems like it is functioning as it should. I will opt out and see if another expert has any other ideas. Please don't rate as the question will then lock to me.
Hey Keith, My names Kurt. I saw the previous expert opt'd out.
being at the dealership I have seen the neg. battery cable be the culprit a few times in this exact situation. But have also seen factory denso alternators being the only ones that work for it for whatever reason.
First lets check that ground cable. Can you make sure it and the power wire cables on teh battery are nice and snug on the battery and dont move around.
After that, where the ground wire attaches to the body can you unbolt that, get some sand paper or something to scuff up and clean up the terminal on the end of the cable and also the point where it bolts to the car?
once that is done, start the car and let me know what happens. Also, is the battery light coming on? If not, what about if you unplug the connector on the Alt. will the light come on?
I know A lot of this seems basic, but I want to help you get this issue resolved.
Awesome! Let me know!
Thats awesome!! Glad its been working!
Wiggle the wire going to it if you can, just to eliminate a poor connection. I would go ahead and check that ground cable just to make sure as well since I have seen that cause issues.
No, The charging system on this vehicle is not ECU controlled. The two most common failures I have seen have been bad aftermarket alternators, or a bad ground wire.
Just double check the connections make sure they are all tight and also that the belt is tight and not slipping. If it all checked out and you are showing 14.00v then you are good to go!
awesome! Not sure on the not charging, then charging either, but If its not broke, dont fix it haha.
Enjoy the car!
thats good news! The only thing I can think of, is a bad connection that got fixed while checking things. It happens pretty often!
Glad its working!
The only thing it can be is the alt. at this point.
I would HIGHLY suggest getting a reman denso alt. for the car.
Thats VERY odd. Let me go back and double check the wiring diagram on this. 05 Scion XB right?