So the LT1 is from a 95, It has one larger wire from the post on the alternator to the battery, and one wire on the plug on the back. I replaced the alternator after the last one started over charging. I had the wire for the plug going strait to a 12v junction.

Now after replacing the alt. the gauge on my IP doesnt change when the car is off and on, leading me to think the alt. isnt charging. I tried wiring a 470 ohm resistor inline with the wire that plugs into the back of the alt. still nothing.

 

First alt likely burned up because it didnt have the resistor inline with the 12v source

Second sounds like a bad replacement. Have it tested

 

Sounds good thanks pocket. Is it possable that they gave me one that I have to have one pin get power and another the signal wire with the resistor?