I think we'll need a little more information on this.
What compressor/control system is in the car? Does it use analog gauges and manual switches, or is it a digital control system?
If it is digital what does the display panel/user interface look like?
Does the battery have a decent charge? (the easiest way to check this, is to start the car. When the engine is running, the alternator is putting out 14.4V. Don't count on a battery charger. A running engine with a good alternator is the best solution to low voltage issues.)
When the RR will not inflate, will any other corner inflate? (We are checking tank pressure with this test. If you have low tank pressure, no corner will inflate. If the tank pressure is good, the other corners will inflate with no issues.)
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