1994 C3500 1ton dually 454 V-8 gas burner R134a system. The air quit working and I assumed low refrigerant. Hooked up the gauges but looked ok. I found the compressor clutch would engage for about a second sometimes but mostly none at all. I bypassed the low pressure cutout on the accumulator but still wouldn't engage. Pulled the power to the compressor and read 11.59 volts with a meter. I thought this was enough to engage the clutch but apparently not, perhaps amperage is low. Ran a jumper direct from the battery (12.49 volts) and clutch engages fine. Any ideas or suggestions why I have low voltage at the power source, what to look for, any experience with similar problem.
Thanks, HotRodr56