Just after finishing an engine re-build and when we went to start the car up there was no spark. We can hear the fuel pump priming but there is no live to pin 20 on the ECU. The yellow relay by the ECU appears to be ok but not sure where to go from here?? whats next to test from here to continue troubleshooting - i.e. ignition relay - where is it - relay slot number? Lights all come on in the clock when the key is turned. There is an after market alarm and immobilser on the car but this has been activated and turned off and back on again and looks like it's working fine so I don't think it's this but not ruling it out yet.