If he's followed GM wiring...
How to read GM data, See my Cave, Wire Reading
You likely need to read that before trying alldatadiy.com, Haynes and other books too.
Haynes and others books are unreliable for engine swaps. Alldata have exact data for Model Year of car.
Example: Some C500 pins change for MY of car your dealing at the time.
is for lights but others can move deleted or added.
------------------Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)The Ogre's Fiero Cave
[This message has been edited by theogre (edited 08-05-2017).]