I have checked the voltage on the two wire plug and have the voltages there. I would think one would go to battery volts and the other to the light in the dash like most systems. The battery light does work and goes out after starting. Also the big wire for output seems to be ok, did what you said, ran a jumper direct to battery. Also ran a ground direct to the alternator, still no charge output. I did not know if they are using a resistor or something inline with the sensor wire. Just seems odd that a new alternator would be bad and do the same thing as the old one, but I know new parts can be bad also, just wanted to make sure I wasn't missing something. Thanks.