Loaded the wife on the bike and dog in his trailer and fired up the bike yesterday. Noticed right off there was a whining noise coming through the headset. Checked the voltage and saw it was sitting at just over 12 v. Figured I lost the alternator again. It's a Compufire. I lost it earlier after only 7,000 miles and had it rebuilt. Have put 11,000 miles on it since the rebuild. At the same time I had the Compufire rebuilt I had the OE alternator double checked( showed good) so kept it for an emergency spare. Thinking this is just such an emergency, I pulled the Compufire and put the OE back in. Fired it up and same thing, voltage at battery level and noise in the headset. I had rode the bike in some light rain returning from a campout a few days earlier and charging system was okay. All electrical systems are working just fine other than the charging. I did have to weld on the rear end 2 weeks ago. It has a Moto Trike kit on it and the top left swing arm mount broke off the rear end. Design flaw from MotoTrike - not enough bracing on this mount in my opinion. Anyway, when I repaired the mount I disconnected the battery and took out the main fuse links plus grounded right at my work. The bike performed well for several days and now this. Anyone have an idea as to what would cause the charging system to go out just sitting in the garage? By the way I always keep the bike on a battery maintainer when not being ridden.I am at a loss as to what would cause this. I pulled the trailer connection apart to see if there might have been a direct short in there from the rain but it's okay. Will ask the Sgt. Major ( wife) to take them both in tomorrow to be checked out and rebuilt if nec. Anyone have any ideas as to what else I should be looking at or for?