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please i carried a loop check on some of devices to be specific my GT air inlet clogging filter transmitter. i noticed there was no power at my marshaling kiosk and my mark v cabinet. after troubleshooting i noticed that even the associated pressure switch did not have power at their terminal point on the Mark V board, but when disconnected from the board the was power on those points in the card. yes there is voltage supply from my dc source and my split voltage is okay. how come i do not have voltages at this point on my Mark v card?