Lexus Troubleshooting Questions? Ask a Lexus Expert
My name is Jim. First let's start with the wiring diagram and a few questions:
1. Does the charge light come on ?
2. Does it go out after the car is started?
Here is the diagram for your car : Notice you have 3 power supplies @ terminal 1 - 2 and 3. If you have the key on and engine off what is your voltage readings?
The most likely place to look : you will need to take your volt meter , disconnect the alternator connecitons and test for voltage as I described above. Be careful not to short anything out. If you do not feel you can do this then you will need to have it checked by a professional shop. I have checked out vehilces before for customers and they did their own repairs.
First check the fuses. If the fuses are good and you have voltage to the terminals that you need to check the alt is no good. Did your old alt have the light on? It is possible to have a bad rebuilt alternator. Jim
Above connectors G1 Battery Voltage G2 unplug alternator and check for voltage in pin 1 2 & 3 Key On Engine Off. What are your readings? I will check back..
It turned out to be a "DOA" alternator, nothing more than that.
Installed another alternator and all is working as it was designed, bad parts can be difficult to prove.