This isn't a new topic as it was discussed thoroughly back in November - see:http://www.busconversions.com/bbs/index.php?topic=5471.0I had experienced this with my 1963 gm4106 starting in June, and it only got worse. Eventually the alternator began to work only intermittently, sometimes lighting up the "not gen" tell-tale, sometimes not. But as I have a dashboard voltmeter, it was always obvious when it wasn't working, plus the tachometer which runs off the relay terminal would reflect the condition by its own erratic action. For a while I could get it to work occasionally by putting a load on the system - turning on everything - but it finally quit entirely about halfway between Las Vegas and Twin Falls. So, the tests began - generator and regulator diodes, etc., and everything checked out OK. But the problem turned out to be a bad (open) coil in the starter control and generator relay - rear electrical compartment. I had little luck finding a replacement relay, but did find the ultimate fix at Coach Information Network in a well-thought out procedures manual to replace that part of the system with a magnetic switch. It involved changing some wires around, mounting the magnetic switch, etc., - about an hour's job.The results are that there is no more pulsing and the voltage stays rock steady at all rpms regardless of the load. There is no waiting for the generator to kick in either - its registering instantly and the tach even registers the rpm during the starting process. In the change-over the "not gen" light is removed from the system and there is no more starter interlock. But the tach and the voltmeter always indicate that its working. I don't need the starter interlock because my starter switch is keyed, and because the V730 has its own interlock to prevent starter engagement while in gear. In a companion procedures manual, the generator sensing relay and the big resister that goes with it are also replaced by a magnetic switch. The earlier 4106's did not have this particular relay.This may not be of help to owners of other coaches - perhaps not even to other GM models, but it was the real ticket for mine.tg