Yes, I was writing predominantly about the L322 and not the even older P38, but also the Disco's that use the same Wabco style suspension compressor. But, you write "Inlet air and exhaust air are 2 separate circuits". I don't believe that is so, certainly not with any of the several RR...

I'm amazed at how many people experience similar problems with the suspension compressor and don't understand how it works and why the computers are confused enough to shut things down. I'm a computer geek so let me point out that cpomputers are only as useful when they are programmed well...

Hello Pete J-L. I'm coming late to the party but if you're still working on this problem I may be able to help. I think you were on the right track when you remarked that the radio, etc is not receiving power. Yes, water in the gubbins in the back can cause problems, such as arcing when wet...