97 Nissan Pickup AC Compressor Wont Turn On

I have done the following:
1. r134a levels are good
2. jumpered direct from battery to compressor compressor runs
3. jumpered low pressure switch compressor does not run
4. no voltage at AC relay but compressor runs when I unplug the relay and jumper the open circuit.
5. the fuse is good
6. the dash compressor switch is good.

For some reason my AC relay is not getting voltage at the coil, I cannot figure out why, I have checked everything.

Answers for The Question

  1. Thomas D
  2. Jules G
  3. Cyclops