Looks te me we had the same problem with my wife's M3W rectifier. The first day on our last trip to France she was complaining about a low output of her regulator, just 12.2V. After some fiddling on the wire's all was OK again and the reading was 13.2V Next day the reading dropped again to 12.1V. Checked the wire's, redone the earth cable to the frame but nothing helped. Changed the rectifier for the HD unit and reading was back around 14V at idle. But with this HD unit the reading shows most of the times around 16V when driving. This looks a little bit high to my opinion. Checked if the battery went warm with this load, this was negative. Did now about 500km. with the HD unit and all still works well. Can anybody tell me if this is OK or do I need to go back to the original rectifier?
