ok guy's i have a question i have a 86 iroc that i just got done doing a lt1 swap on the car runs great besides one little problem i took the alternator off and had it tested and it came back fine but the car still will not charged i can drive the car for like 10 min then the car dies i tried to hook up a manual gauge but it will not read the main wire that goes from the alt to the battery has power but the one red wire from the alt to the computer has no power so if anyone has a idea let me know also i had the computer reprogrammed to remove the vatts system and the lt1 gauges because i was going to use the manual type gauges so could that be my problem please help thanks

 

ehh, if u took it off and got it tested and it passed, it means nothing, because i had an alternator checked out at kragens then i put it in my car and when i hooked up the multimeter to the back of the alternator and the negative battery terminal it said it was not charging. so dont listen to kragens or wherever u took it too, bottom line is it isnt charging right? im just saying put it on the car and check with the multimeter

 

If you are using the LT1 alternator you may need to power up the "L" terminal to enable teh internal regulator. Usually, the PCM does that, but not if the wire harness is not present or if it has been programmed out.

 

if the test came back good then its good. idk where you took it to get tested but i know that at Advance auto parts they do a good test on them. i work at one and test them all the time. if it shows its putting out volts then its good. they can check the diodes to.