Hi both, #6 - yes, thats the connector. Green is IGN feed, now wired to +12V Red is LAMP. The red Lamp lights when ignition is on (suggesting to me its wired correctly), but won't go out when engine is running, and alternator is working (showing 14.3V). Blue isn't used (generic cheap Chinese connector) Plus there is the fat +12V cable (brown on standard setup, taken from the starter) From conversations with RJ, and looking at Andrew Revill's comment in the other thread, my understanding is that the EU3 ECU controls a standard alternator via the "sensor" connection. "Sensor" can be an input or an output for some alternators, and just not needed for others. The WOSP controls itself, and I'm seeing a consistent 14.3 at idle and when revved, so the sense wire in the EUC connector isn't needed. Unlike a standard Eu3 alternator, the WOSP needs a dedicated IGN feed, which it now has, and seems happy with. But the damn light won't go out! I'll try a 12v/2W bulb as above between LAMP and IGN (and a voltmeter) and see what happens. But it looks good enough to get me up Harewood Hill at the weekend, which is the main thing.