Hi guy's. I've just installed a new apexi power fc into my rb25det powered s15. When I turn ignition on I get a fast continuous relay clicking noise and the engine management light flickers on and off. I'm totally baffled as the ecu works on my friends r33 gtst fine and my mines ecu works fine on the s15. I also noticed that with the pfc my apexi avcr won't start up. I looked at the voltage on the hand controller and the ecu is only receiving 6.9v. Surely this should be 12v...if anyone has any clues as to what it could be or has experienced this problem please let me know. It's driving me mad.