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Well, if you jumpered the low-pressure switch and the clutch plug now has 12V and didn't without the jumper, then that suggests low system pressure. However, if you now have 12V at the clutch plug by jumpering, and the clutch still won't engage, then there is another issue.
If you have power, then the clutch fuse is not blown. If the clutch coil were shorted, it would blow a fuse. If it were open, that would explain why the clutch won't engage even with power applied. You say you have continuity on the clutch coil - how many ohms?
Do you have access to a pressure gauge, so you can check high and/or low side pressure? Is this still R12 or converted to R134a?
If you have power, then the clutch fuse is not blown. If the clutch coil were shorted, it would blow a fuse. If it were open, that would explain why the clutch won't engage even with power applied. You say you have continuity on the clutch coil - how many ohms?
Do you have access to a pressure gauge, so you can check high and/or low side pressure? Is this still R12 or converted to R134a?