DR.DIESEL,

Thank you very much. I'm glad the diagnoses is pointing to Regulator rather than the AC Control Unit. But before concluding, out of curiousity, can I ask a few more questions:-

(1) When testing the middle pin, why is the voltage increasing as the switch reduce from 5 to 0. Some 1 suggest as the swicth increases, so should the voltage?

(2) Can you recommend a www site to purchase at a reasonable price?

Kind regards