On my early 69 S2 the ignition warning light stays on all the time. I have read much information in the archives and the wonderful articles by Mike Frank that explains how the 11AC alternator works, and the function of the AL signal:
I have 14.5 volts at the battery with the engine running. I removed the 3AW relay and tested it according to Mike Frank that is within spec. I disconnected the wire from the AL terminal on the 3AW relay and with the engine running it is reading over 14 volts AC. I understand the the voltage at the AL terminal should be between 7-7.5 volts AC.
The alternator is only 11 months old and still under warranty. Before I return it to the vendor I just wanted to verify that it is out of spec and probably causing the problem. To confirm my readings I had it tested by a local electrical house and they verified that the AL terminal on the alternator was producing 14.8 volts AC.
Thanks for your help,