I think this is all pointing one way, but I'd check a couple of other things. The red light seemed to go on and off when it felt like it. Disconnect the wire to the light at the alternator and connect it to earth. With the ignition on does the red light now come on bright and constant? As well as using a multimeter I also checked the voltages with an OBD scanner. Same results as yesterday with 12.2V engine running and sub 12V with everything on. Revving did nothing to the voltages. It sounds as if the wiring and connections aren't the problem, but do the same voltage test at the output terminal of the alternator. Jonathan