I installed a new alternator and it was working for about a week then the battery light came on and it's not charging my battery so I bought a new battery and the battery light is still on I just want to know how to make this better light go off and to make my alternator charge my alternator 100 amp fuse is good I'm thinking maybe a fusible link I wanted to know what you thought or possibly the computer that is hooked up to the alternator
On your 2000 Camry the computer isn't hooked up to the alternator. The alternator has an internal voltage regulator.
First make sure that the drive belt is tight and isn't slipping. Grab it and make sure it feels tight. Then start the car and put the electrical system under load (headlights and blower on) and look at the belt to make sure it isn't slipping again.
You have 3 wires at the alternator connector and 1 large wire that goes to the battery through the 100 Amp fuse.
It looks like this (your wire colors may or may not match up with the color abbreviations on the diagram. Don't worry about it)
The 3 terminals on the alternator connector are called S, L, and IG. The one on the threaded lug going to the battery is called B
You want to test the integrity of the wiring and see if they're getting power (you can see in the diagram which fuses protect each wire).
1) Start the car. Make sure that the battery light is indeed staying lit.
Now disconnect the wiring connector from the alternator. Make sure that the battery light goes out (this tells you that the wire going to the L terminal isn't grounding out on something).
2) Grab a test light. Hook up the alligator clip to the Negative battery post and then probe the 3 terminals on the wiring connector (ignition ON)
The test light should light brightly as you probe the S and IG terminals and light dimly as you probe the L terminal (because the L terminal will be sharing voltage with the battery dash light and your test light)
If that happens then you know those 3 wires and their fuses are OK.
3) Next you'll need to check for voltage drop in the battery cables.
Here's how you do that.
https://www.youtube.com/watch?v=DVl7vcFzCCw
4) Lastly check the voltage output at the alternator B threaded lug and alternator case ground and make sure it's within a 1/2 volt of what your measuring at the battery positive and negative posts
As usual, excellent @jack62. Thanks!
Start with load test the battery and alternator.
