Starting to look at the AC on my 71 (factory AC)... All blower speeds and Vac/doors respond fine. Jumpered the Ambient switch no power on the light blue wire. Jumpered 12V to Compressor, engages fine, compressor is quiet, sight glass shows freon moving. When I put wiring back to normal, the anti-diesel relay does engage the compressor when I turn off the ignition switch. Where to next?? Any advice appreciated.