2000 Oldsmobile Silhouette.
3400 V6 engine.
Question: I had my van at my parent's to help my brother fix his same make and model van A/C doesn't work. He unplugged the compressor to check voltage on mine to see if it was the same as his
(mine was currently working prior to this) and he turned the van air conditioning on and checked to see that mine now had no voltage at the compressor either. Since then I have no a/c. I checked the fuses and relays as best I can and they seem to be working.
Answer: Use a test light to check fuses. Make sure the A/C CLU fuse in the under hood box is good, swap the A/C CLU relay with another one in the box.
If it worked before he tried to test your wires, he may have done something wrong.
With the van and the A/C on, check the Dark Green wire with a test light connected to a good ground. It should light. Let me know what you find...